<div class="xblock xblock-public_view xblock-public_view-vertical" data-runtime-class="LmsRuntime" data-request-token="5678420a0d9611efa9690affe8bd68a3" data-usage-id="block-v1:MITx+22.011x+3T2018+type@vertical+block@f792c3b08fab4782a1859b8a0d371590" data-runtime-version="1" data-course-id="course-v1:MITx+22.011x+3T2018" data-init="VerticalStudentView" data-has-score="False" data-graded="True" data-block-type="vertical">
<h2 class="hd hd-2 unit-title">3.1.5. Video Lecture</h2>
<div class="vert-mod">
<div class="vert vert-0" data-id="block-v1:MITx+22.011x+3T2018+type@video+block@4377122a4154409792f8b6719f15630f">
<div class="xblock xblock-public_view xblock-public_view-video xmodule_display xmodule_VideoBlock" data-runtime-class="LmsRuntime" data-request-token="5678420a0d9611efa9690affe8bd68a3" data-usage-id="block-v1:MITx+22.011x+3T2018+type@video+block@4377122a4154409792f8b6719f15630f" data-runtime-version="1" data-course-id="course-v1:MITx+22.011x+3T2018" data-init="XBlockToXModuleShim" data-has-score="False" data-graded="True" data-block-type="video">
<script type="json/xblock-args" class="xblock-json-init-args">
{"xmodule-type": "Video"}
</script>
<h3 class="hd hd-2">Video</h3>
<div
id="video_4377122a4154409792f8b6719f15630f"
class="video closed"
data-metadata='{"saveStateEnabled": false, "transcriptTranslationUrl": "/courses/course-v1:MITx+22.011x+3T2018/xblock/block-v1:MITx+22.011x+3T2018+type@video+block@4377122a4154409792f8b6719f15630f/handler/transcript/translation/__lang__", "transcriptLanguage": "en", "prioritizeHls": false, "captionDataDir": null, "autohideHtml5": false, "generalSpeed": 1.0, "speed": null, "transcriptAvailableTranslationsUrl": "/courses/course-v1:MITx+22.011x+3T2018/xblock/block-v1:MITx+22.011x+3T2018+type@video+block@4377122a4154409792f8b6719f15630f/handler/transcript/available_translations", "transcriptLanguages": {"en": "English"}, "ytMetadataEndpoint": "", "lmsRootURL": "https://openlearninglibrary.mit.edu", "completionEnabled": false, "start": 0.0, "ytTestTimeout": 1500, "ytApiUrl": "https://www.youtube.com/iframe_api", "autoplay": false, "end": 0.0, "recordedYoutubeIsAvailable": true, "duration": 418.05, "savedVideoPosition": 0.0, "publishCompletionUrl": "/courses/course-v1:MITx+22.011x+3T2018/xblock/block-v1:MITx+22.011x+3T2018+type@video+block@4377122a4154409792f8b6719f15630f/handler/publish_completion", "showCaptions": "true", "saveStateUrl": "/courses/course-v1:MITx+22.011x+3T2018/xblock/block-v1:MITx+22.011x+3T2018+type@video+block@4377122a4154409792f8b6719f15630f/handler/xmodule_handler/save_user_state", "streams": "1.00:7oyPg2UqS3s", "completionPercentage": 0.95, "autoAdvance": false, "sources": ["https://d2f1egay8yehza.cloudfront.net/MITx22.011x-V010000/MITx22.011x-V010000.m3u8", "https://d2f1egay8yehza.cloudfront.net/MITx22.011x-V010000_DTH.mp4"], "poster": "https://mitx-edx-video-meta-storage.s3.amazonaws.com/media/video-images/d62b18600f29439983f990b37d0897d8.png?x-amz-security-token=IQoJb3JpZ2luX2VjEKD%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaCXVzLWVhc3QtMSJIMEYCIQCU0D2J1xkhDk2JflPPScLirzWTdFU0Hkh2Kf4sfu8gYgIhAKp%2FYyCNijCKgtPMshADG7hUuTQSVm%2FrXqTjH2zApSwMKsMFCPj%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEQAxoMODU5MjA1NjM3NDExIgxLzvvG%2BjyYrWfnGskqlwXDNzhjJfuPqakQXwF9LM2fpaSYjIS%2BeyJWmiB%2BPVNe9BSaPqoR0FrQ82qdT1QiPggXcgef2KJl%2FLM%2Fn8P4KiMdjwfqLVWj2jDKs1llEt38R8YWH0jr1O%2F8QZa94isf%2FTXE%2BlSihrN43vRIIi5xAYZZX0Y7KI9hnsQIZyTskJibq667nju36B9tbtFawFtM5MYvM1jSzVjIOH1QN2zlbaDacClMq1%2FtkiV0jgpdLEd9mjaNa1U2TkshncDilOo%2B3j5Nu8KBt1woVufR3KGfnixCAQDjGJZ5ewsX2HHubGVeWHNOaufaX1tFKf%2FgBE6fnArfKOfW%2FIRWvXpQ42hBUx6htfO8BGJk5VBn02RLECOhdadrDN%2FMJ8OWC3R%2F4p8%2FZl8eUDN5vnqVAwwPQNSezaIxgxlHozYI8rcA%2BxwP9iuE%2BR5jAZ633%2BZba15i1otqierMaMGCVsAOme9qwv6bxcS7mdzbR7hJm7q3q0NTMZFWxIBgk7QaAO5sm%2FW9jpF%2BR2e9%2FyR6DbRs9vpnO3LHzNcqa4L74q8mrYhq07UV4jTE51vEMk%2BnD74hzNcuF3cG07M3AmnC1oPoNglVR7tmix9v0697JXnISFf8gMdwUM759kfeSI2Q%2FHbRh%2BP6cygCDzTJa73oXl0fJS9vdm4mSo37p5Y4ukTPJmaXAEu%2FdqWh814DhhQJCIrBcGhqlJbHcDLyt%2FmUzMgrsjjFha0p%2FGTBbmJ6enf184T4MpqAvIrlBnodJyK7E97DmDogXNKgDmD7vI%2B43Em06VRCKpK%2Bcxdkn4jWH%2Fh74fqwqfS9po7U3SvQBOXZfsFUTLLwADOdwI4lMKskGLspmkBg3oENANtKVFTKE3gqwx2G77TGExKyRjHSDd%2B4H44wlI%2FwsQY6sAGqhJkuBJYXLW8pIo%2F%2B15RBATEpr4%2BlPggCzOa4ySwJdRIL0xL0QEweEm0osABfcxltRkzwargFc9TrZDWbjb9NfLvw9CPn7rLfuw4k63s9zbFO5OsbsfNjkDUogqMVER55P91069NgWkt%2FZyCyzmMnQJ0OPvhqSy8z0HAP76pkl5ssbn7nWTuZGghcwj0TO03ReFqgBtxdPx5vv8M46qsTwFfKuiErg%2FLd6lCIlhoYfQ%3D%3D&Signature=Hrf%2Fk8Izwb%2Bn6K38dK9t0Nqj8Yg%3D&Expires=1715212782&AWSAccessKeyId=ASIA4QDFFSUR26I23L2Z"}'
data-bumper-metadata='null'
data-autoadvance-enabled="False"
data-poster='null'
tabindex="-1"
>
<div class="focus_grabber first"></div>
<div class="tc-wrapper">
<div class="video-wrapper">
<span tabindex="0" class="spinner" aria-hidden="false" aria-label="Loading video player"></span>
<span tabindex="-1" class="btn-play fa fa-youtube-play fa-2x is-hidden" aria-hidden="true" aria-label="Play video"></span>
<div class="video-player-pre"></div>
<div class="video-player">
<div id="4377122a4154409792f8b6719f15630f"></div>
<h4 class="hd hd-4 video-error is-hidden">No playable video sources found.</h4>
<h4 class="hd hd-4 video-hls-error is-hidden">
Your browser does not support this video format. Try using a different browser.
</h4>
</div>
<div class="video-player-post"></div>
<div class="closed-captions"></div>
<div class="video-controls is-hidden">
<div>
<div class="vcr"><div class="vidtime">0:00 / 0:00</div></div>
<div class="secondary-controls"></div>
</div>
</div>
</div>
</div>
<div class="focus_grabber last"></div>
<h3 class="hd hd-4 downloads-heading sr" id="video-download-transcripts_4377122a4154409792f8b6719f15630f">Downloads and transcripts</h3>
<div class="wrapper-downloads" role="region" aria-labelledby="video-download-transcripts_4377122a4154409792f8b6719f15630f">
<div class="wrapper-download-transcripts">
<h4 class="hd hd-5">Transcripts</h4>
<ul class="list-download-transcripts">
<li class="transcript-option">
<a class="btn btn-link" href="/courses/course-v1:MITx+22.011x+3T2018/xblock/block-v1:MITx+22.011x+3T2018+type@video+block@4377122a4154409792f8b6719f15630f/handler/transcript/download" data-value="srt">Download SubRip (.srt) file</a>
</li>
<li class="transcript-option">
<a class="btn btn-link" href="/courses/course-v1:MITx+22.011x+3T2018/xblock/block-v1:MITx+22.011x+3T2018+type@video+block@4377122a4154409792f8b6719f15630f/handler/transcript/download" data-value="txt">Download Text (.txt) file</a>
</li>
</ul>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<div class="xblock xblock-public_view xblock-public_view-vertical" data-runtime-class="LmsRuntime" data-request-token="5678420a0d9611efa9690affe8bd68a3" data-usage-id="block-v1:MITx+22.011x+3T2018+type@vertical+block@0dce4eed8d4b4d69a2d389d178561926" data-runtime-version="1" data-course-id="course-v1:MITx+22.011x+3T2018" data-init="VerticalStudentView" data-has-score="False" data-graded="True" data-block-type="vertical">
<h2 class="hd hd-2 unit-title">3.1.5. Notes & Additional Material</h2>
<div class="vert-mod">
<div class="vert vert-0" data-id="block-v1:MITx+22.011x+3T2018+type@html+block@98b76edcf3c7465c83db428f665aa3a3">
<div class="xblock xblock-public_view xblock-public_view-html xmodule_display xmodule_HtmlBlock" data-runtime-class="LmsRuntime" data-request-token="5678420a0d9611efa9690affe8bd68a3" data-usage-id="block-v1:MITx+22.011x+3T2018+type@html+block@98b76edcf3c7465c83db428f665aa3a3" data-runtime-version="1" data-course-id="course-v1:MITx+22.011x+3T2018" data-init="XBlockToXModuleShim" data-has-score="False" data-graded="True" data-block-type="html">
<script type="json/xblock-args" class="xblock-json-init-args">
{"xmodule-type": "HTMLModule"}
</script>
<p><strong>Use the following links to download this lecture's notes:</strong></p>
<p><a href="/assets/courseware/v1/5df75c8264dd933f19c7107545ec6480/asset-v1:MITx+22.011x+3T2018+type@asset+block/Unit_3.1.5_required_pdf_lecture_notes__vf.pdf" target="[object Object]">Lecture 3.1.5. [The Promise of Fusion] - Required Lecture Notes</a></p>
<p><a href="/assets/courseware/v1/163edc39a46b5fca24bea89010e5f137/asset-v1:MITx+22.011x+3T2018+type@asset+block/Unit_3.1.5_optional_pdf_lecture_notes_vf.pdf" target="[object Object]">Lecture 3.1.5. [The Promise of Fusion] - Optional Lecture Notes</a></p>
<p></p>
<p></p>
</div>
</div>
</div>
</div>
<div class="xblock xblock-public_view xblock-public_view-vertical" data-runtime-class="LmsRuntime" data-request-token="5678420a0d9611efa9690affe8bd68a3" data-usage-id="block-v1:MITx+22.011x+3T2018+type@vertical+block@848beed1108940a7848b46ead0fe3996" data-runtime-version="1" data-course-id="course-v1:MITx+22.011x+3T2018" data-init="VerticalStudentView" data-has-score="False" data-graded="True" data-block-type="vertical">
<h2 class="hd hd-2 unit-title">3.1.5. Required Assessment</h2>
<div class="vert-mod">
<div class="vert vert-0" data-id="block-v1:MITx+22.011x+3T2018+type@problem+block@dcc51fda556c4b7cab7d883d20537758">
<div class="xblock xblock-public_view xblock-public_view-problem xmodule_display xmodule_ProblemBlock" data-runtime-class="LmsRuntime" data-request-token="5678420a0d9611efa9690affe8bd68a3" data-usage-id="block-v1:MITx+22.011x+3T2018+type@problem+block@dcc51fda556c4b7cab7d883d20537758" data-runtime-version="1" data-course-id="course-v1:MITx+22.011x+3T2018" data-init="XBlockToXModuleShim" data-has-score="True" data-graded="True" data-block-type="problem">
<script type="json/xblock-args" class="xblock-json-init-args">
{"xmodule-type": "Problem"}
</script>
<div id="problem_dcc51fda556c4b7cab7d883d20537758" class="problems-wrapper" role="group"
aria-labelledby="dcc51fda556c4b7cab7d883d20537758-problem-title"
data-problem-id="block-v1:MITx+22.011x+3T2018+type@problem+block@dcc51fda556c4b7cab7d883d20537758" data-url="/courses/course-v1:MITx+22.011x+3T2018/xblock/block-v1:MITx+22.011x+3T2018+type@problem+block@dcc51fda556c4b7cab7d883d20537758/handler/xmodule_handler"
data-problem-score="0"
data-problem-total-possible="1"
data-attempts-used="0"
data-content="
<h3 class="hd hd-3 problem-header" id="dcc51fda556c4b7cab7d883d20537758-problem-title" aria-describedby="block-v1:MITx+22.011x+3T2018+type@problem+block@dcc51fda556c4b7cab7d883d20537758-problem-progress" tabindex="-1">
Assessment 1
</h3>
<div class="problem-progress" id="block-v1:MITx+22.011x+3T2018+type@problem+block@dcc51fda556c4b7cab7d883d20537758-problem-progress"></div>
<div class="problem">
<div>
<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 1" role="group"><div class="choicegroup capa_inputtype" id="inputtype_dcc51fda556c4b7cab7d883d20537758_2_1">
<fieldset aria-describedby="status_dcc51fda556c4b7cab7d883d20537758_2_1 description_dcc51fda556c4b7cab7d883d20537758_1_1">
<legend id="dcc51fda556c4b7cab7d883d20537758_2_1-legend" class="response-fieldset-legend field-group-hd">For the \(D-T\) fusion reaction, roughly how much more energy per kg is produced compared to a chemical reaction, such as burning coal?</legend>
<p class="question-description" id="description_dcc51fda556c4b7cab7d883d20537758_1_1">Select only one option.</p>
<div class="field">
<input type="radio" name="input_dcc51fda556c4b7cab7d883d20537758_2_1" id="input_dcc51fda556c4b7cab7d883d20537758_2_1_choice_0" class="field-input input-radio" value="choice_0"/><label id="dcc51fda556c4b7cab7d883d20537758_2_1-choice_0-label" for="input_dcc51fda556c4b7cab7d883d20537758_2_1_choice_0" class="response-label field-label label-inline" aria-describedby="status_dcc51fda556c4b7cab7d883d20537758_2_1 description_dcc51fda556c4b7cab7d883d20537758_1_1"> About 17,500,000 times more
</label>
</div>
<div class="field">
<input type="radio" name="input_dcc51fda556c4b7cab7d883d20537758_2_1" id="input_dcc51fda556c4b7cab7d883d20537758_2_1_choice_1" class="field-input input-radio" value="choice_1"/><label id="dcc51fda556c4b7cab7d883d20537758_2_1-choice_1-label" for="input_dcc51fda556c4b7cab7d883d20537758_2_1_choice_1" class="response-label field-label label-inline" aria-describedby="status_dcc51fda556c4b7cab7d883d20537758_2_1 description_dcc51fda556c4b7cab7d883d20537758_1_1"> About 500,000 times more
</label>
</div>
<div class="field">
<input type="radio" name="input_dcc51fda556c4b7cab7d883d20537758_2_1" id="input_dcc51fda556c4b7cab7d883d20537758_2_1_choice_2" class="field-input input-radio" value="choice_2"/><label id="dcc51fda556c4b7cab7d883d20537758_2_1-choice_2-label" for="input_dcc51fda556c4b7cab7d883d20537758_2_1_choice_2" class="response-label field-label label-inline" aria-describedby="status_dcc51fda556c4b7cab7d883d20537758_2_1 description_dcc51fda556c4b7cab7d883d20537758_1_1"> About 350 times more
</label>
</div>
<div class="field">
<input type="radio" name="input_dcc51fda556c4b7cab7d883d20537758_2_1" id="input_dcc51fda556c4b7cab7d883d20537758_2_1_choice_3" class="field-input input-radio" value="choice_3"/><label id="dcc51fda556c4b7cab7d883d20537758_2_1-choice_3-label" for="input_dcc51fda556c4b7cab7d883d20537758_2_1_choice_3" class="response-label field-label label-inline" aria-describedby="status_dcc51fda556c4b7cab7d883d20537758_2_1 description_dcc51fda556c4b7cab7d883d20537758_1_1"> Actually, less is produced
</label>
</div>
<span id="answer_dcc51fda556c4b7cab7d883d20537758_2_1"/>
</fieldset>
<div class="indicator-container">
<span class="status unanswered" id="status_dcc51fda556c4b7cab7d883d20537758_2_1" data-tooltip="Not yet answered.">
<span class="sr">unanswered</span><span class="status-icon" aria-hidden="true"/>
</span>
</div>
</div></div>
</div>
<div class="action">
<input type="hidden" name="problem_id" value="Assessment 1" />
<div class="submit-attempt-container">
<button type="button" class="submit btn-brand" data-submitting="Submitting" data-value="Submit" data-should-enable-submit-button="True" aria-describedby="submission_feedback_dcc51fda556c4b7cab7d883d20537758" >
<span class="submit-label">Submit</span>
</button>
<div class="submission-feedback" id="submission_feedback_dcc51fda556c4b7cab7d883d20537758">
<span class="sr">Some problems have options such as save, reset, hints, or show answer. These options follow the Submit button.</span>
</div>
</div>
<div class="problem-action-buttons-wrapper">
</div>
</div>
<div class="notification warning notification-gentle-alert
is-hidden"
tabindex="-1">
<span class="icon fa fa-exclamation-circle" aria-hidden="true"></span>
<span class="notification-message" aria-describedby="dcc51fda556c4b7cab7d883d20537758-problem-title">
</span>
<div class="notification-btn-wrapper">
<button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button>
</div>
</div>
<div class="notification warning notification-save
is-hidden"
tabindex="-1">
<span class="icon fa fa-save" aria-hidden="true"></span>
<span class="notification-message" aria-describedby="dcc51fda556c4b7cab7d883d20537758-problem-title">None
</span>
<div class="notification-btn-wrapper">
<button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button>
</div>
</div>
<div class="notification general notification-show-answer
is-hidden"
tabindex="-1">
<span class="icon fa fa-info-circle" aria-hidden="true"></span>
<span class="notification-message" aria-describedby="dcc51fda556c4b7cab7d883d20537758-problem-title">Answers are displayed within the problem
</span>
<div class="notification-btn-wrapper">
<button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button>
</div>
</div>
</div>
"
data-graded="True">
<p class="loading-spinner">
<i class="fa fa-spinner fa-pulse fa-2x fa-fw"></i>
<span class="sr">Loading…</span>
</p>
</div>
</div>
</div>
<div class="vert vert-1" data-id="block-v1:MITx+22.011x+3T2018+type@problem+block@bbf72c5a92a94ce5b34f570f9a116486">
<div class="xblock xblock-public_view xblock-public_view-problem xmodule_display xmodule_ProblemBlock" data-runtime-class="LmsRuntime" data-request-token="5678420a0d9611efa9690affe8bd68a3" data-usage-id="block-v1:MITx+22.011x+3T2018+type@problem+block@bbf72c5a92a94ce5b34f570f9a116486" data-runtime-version="1" data-course-id="course-v1:MITx+22.011x+3T2018" data-init="XBlockToXModuleShim" data-has-score="True" data-graded="True" data-block-type="problem">
<script type="json/xblock-args" class="xblock-json-init-args">
{"xmodule-type": "Problem"}
</script>
<div id="problem_bbf72c5a92a94ce5b34f570f9a116486" class="problems-wrapper" role="group"
aria-labelledby="bbf72c5a92a94ce5b34f570f9a116486-problem-title"
data-problem-id="block-v1:MITx+22.011x+3T2018+type@problem+block@bbf72c5a92a94ce5b34f570f9a116486" data-url="/courses/course-v1:MITx+22.011x+3T2018/xblock/block-v1:MITx+22.011x+3T2018+type@problem+block@bbf72c5a92a94ce5b34f570f9a116486/handler/xmodule_handler"
data-problem-score="0"
data-problem-total-possible="1"
data-attempts-used="0"
data-content="
<h3 class="hd hd-3 problem-header" id="bbf72c5a92a94ce5b34f570f9a116486-problem-title" aria-describedby="block-v1:MITx+22.011x+3T2018+type@problem+block@bbf72c5a92a94ce5b34f570f9a116486-problem-progress" tabindex="-1">
Assessment 2
</h3>
<div class="problem-progress" id="block-v1:MITx+22.011x+3T2018+type@problem+block@bbf72c5a92a94ce5b34f570f9a116486-problem-progress"></div>
<div class="problem">
<div>
<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 1" role="group"><div class="choicegroup capa_inputtype" id="inputtype_bbf72c5a92a94ce5b34f570f9a116486_2_1">
<fieldset aria-describedby="status_bbf72c5a92a94ce5b34f570f9a116486_2_1 description_bbf72c5a92a94ce5b34f570f9a116486_1_1">
<legend id="bbf72c5a92a94ce5b34f570f9a116486_2_1-legend" class="response-fieldset-legend field-group-hd">In addition to deuterium \(D\) and tritium \(T\), what other isotope is used in the fusion fuel cycle (specifically, this isotope can be used to make tritium)?</legend>
<p class="question-description" id="description_bbf72c5a92a94ce5b34f570f9a116486_1_1">Select only one option.</p>
<div class="field">
<input type="radio" name="input_bbf72c5a92a94ce5b34f570f9a116486_2_1" id="input_bbf72c5a92a94ce5b34f570f9a116486_2_1_choice_0" class="field-input input-radio" value="choice_0"/><label id="bbf72c5a92a94ce5b34f570f9a116486_2_1-choice_0-label" for="input_bbf72c5a92a94ce5b34f570f9a116486_2_1_choice_0" class="response-label field-label label-inline" aria-describedby="status_bbf72c5a92a94ce5b34f570f9a116486_2_1 description_bbf72c5a92a94ce5b34f570f9a116486_1_1"> Helium-3 \((He^3) \)
</label>
</div>
<div class="field">
<input type="radio" name="input_bbf72c5a92a94ce5b34f570f9a116486_2_1" id="input_bbf72c5a92a94ce5b34f570f9a116486_2_1_choice_1" class="field-input input-radio" value="choice_1"/><label id="bbf72c5a92a94ce5b34f570f9a116486_2_1-choice_1-label" for="input_bbf72c5a92a94ce5b34f570f9a116486_2_1_choice_1" class="response-label field-label label-inline" aria-describedby="status_bbf72c5a92a94ce5b34f570f9a116486_2_1 description_bbf72c5a92a94ce5b34f570f9a116486_1_1"> Lithium-6 \((Li^6) \)
</label>
</div>
<div class="field">
<input type="radio" name="input_bbf72c5a92a94ce5b34f570f9a116486_2_1" id="input_bbf72c5a92a94ce5b34f570f9a116486_2_1_choice_2" class="field-input input-radio" value="choice_2"/><label id="bbf72c5a92a94ce5b34f570f9a116486_2_1-choice_2-label" for="input_bbf72c5a92a94ce5b34f570f9a116486_2_1_choice_2" class="response-label field-label label-inline" aria-describedby="status_bbf72c5a92a94ce5b34f570f9a116486_2_1 description_bbf72c5a92a94ce5b34f570f9a116486_1_1"> Carbon-14 \((C^{14}) \)
</label>
</div>
<span id="answer_bbf72c5a92a94ce5b34f570f9a116486_2_1"/>
</fieldset>
<div class="indicator-container">
<span class="status unanswered" id="status_bbf72c5a92a94ce5b34f570f9a116486_2_1" data-tooltip="Not yet answered.">
<span class="sr">unanswered</span><span class="status-icon" aria-hidden="true"/>
</span>
</div>
</div></div>
</div>
<div class="action">
<input type="hidden" name="problem_id" value="Assessment 2" />
<div class="submit-attempt-container">
<button type="button" class="submit btn-brand" data-submitting="Submitting" data-value="Submit" data-should-enable-submit-button="True" aria-describedby="submission_feedback_bbf72c5a92a94ce5b34f570f9a116486" >
<span class="submit-label">Submit</span>
</button>
<div class="submission-feedback" id="submission_feedback_bbf72c5a92a94ce5b34f570f9a116486">
<span class="sr">Some problems have options such as save, reset, hints, or show answer. These options follow the Submit button.</span>
</div>
</div>
<div class="problem-action-buttons-wrapper">
</div>
</div>
<div class="notification warning notification-gentle-alert
is-hidden"
tabindex="-1">
<span class="icon fa fa-exclamation-circle" aria-hidden="true"></span>
<span class="notification-message" aria-describedby="bbf72c5a92a94ce5b34f570f9a116486-problem-title">
</span>
<div class="notification-btn-wrapper">
<button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button>
</div>
</div>
<div class="notification warning notification-save
is-hidden"
tabindex="-1">
<span class="icon fa fa-save" aria-hidden="true"></span>
<span class="notification-message" aria-describedby="bbf72c5a92a94ce5b34f570f9a116486-problem-title">None
</span>
<div class="notification-btn-wrapper">
<button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button>
</div>
</div>
<div class="notification general notification-show-answer
is-hidden"
tabindex="-1">
<span class="icon fa fa-info-circle" aria-hidden="true"></span>
<span class="notification-message" aria-describedby="bbf72c5a92a94ce5b34f570f9a116486-problem-title">Answers are displayed within the problem
</span>
<div class="notification-btn-wrapper">
<button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button>
</div>
</div>
</div>
"
data-graded="True">
<p class="loading-spinner">
<i class="fa fa-spinner fa-pulse fa-2x fa-fw"></i>
<span class="sr">Loading…</span>
</p>
</div>
</div>
</div>
<div class="vert vert-2" data-id="block-v1:MITx+22.011x+3T2018+type@problem+block@ad9a8bd0276f496e83f265e9af49d0e1">
<div class="xblock xblock-public_view xblock-public_view-problem xmodule_display xmodule_ProblemBlock" data-runtime-class="LmsRuntime" data-request-token="5678420a0d9611efa9690affe8bd68a3" data-usage-id="block-v1:MITx+22.011x+3T2018+type@problem+block@ad9a8bd0276f496e83f265e9af49d0e1" data-runtime-version="1" data-course-id="course-v1:MITx+22.011x+3T2018" data-init="XBlockToXModuleShim" data-has-score="True" data-graded="True" data-block-type="problem">
<script type="json/xblock-args" class="xblock-json-init-args">
{"xmodule-type": "Problem"}
</script>
<div id="problem_ad9a8bd0276f496e83f265e9af49d0e1" class="problems-wrapper" role="group"
aria-labelledby="ad9a8bd0276f496e83f265e9af49d0e1-problem-title"
data-problem-id="block-v1:MITx+22.011x+3T2018+type@problem+block@ad9a8bd0276f496e83f265e9af49d0e1" data-url="/courses/course-v1:MITx+22.011x+3T2018/xblock/block-v1:MITx+22.011x+3T2018+type@problem+block@ad9a8bd0276f496e83f265e9af49d0e1/handler/xmodule_handler"
data-problem-score="0"
data-problem-total-possible="1"
data-attempts-used="0"
data-content="
<h3 class="hd hd-3 problem-header" id="ad9a8bd0276f496e83f265e9af49d0e1-problem-title" aria-describedby="block-v1:MITx+22.011x+3T2018+type@problem+block@ad9a8bd0276f496e83f265e9af49d0e1-problem-progress" tabindex="-1">
Assessment 3
</h3>
<div class="problem-progress" id="block-v1:MITx+22.011x+3T2018+type@problem+block@ad9a8bd0276f496e83f265e9af49d0e1-problem-progress"></div>
<div class="problem">
<div>
<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 1" role="group"><div class="choicegroup capa_inputtype" id="inputtype_ad9a8bd0276f496e83f265e9af49d0e1_2_1">
<fieldset aria-describedby="status_ad9a8bd0276f496e83f265e9af49d0e1_2_1 description_ad9a8bd0276f496e83f265e9af49d0e1_1_1">
<legend id="ad9a8bd0276f496e83f265e9af49d0e1_2_1-legend" class="response-fieldset-legend field-group-hd">Scientists have been studying how to harness fusion energy to make clean electricity for decades. What are some benefits of fusion energy?</legend>
<p class="question-description" id="description_ad9a8bd0276f496e83f265e9af49d0e1_1_1">Choose all that apply. </p>
<div class="field">
<input type="checkbox" name="input_ad9a8bd0276f496e83f265e9af49d0e1_2_1[]" id="input_ad9a8bd0276f496e83f265e9af49d0e1_2_1_choice_0" class="field-input input-checkbox" value="choice_0"/><label id="ad9a8bd0276f496e83f265e9af49d0e1_2_1-choice_0-label" for="input_ad9a8bd0276f496e83f265e9af49d0e1_2_1_choice_0" class="response-label field-label label-inline" aria-describedby="status_ad9a8bd0276f496e83f265e9af49d0e1_2_1 description_ad9a8bd0276f496e83f265e9af49d0e1_1_1"> Fusion energy, like fission energy, does not release carbon dioxide CO2 and other greenhouse gases
</label>
</div>
<div class="field">
<input type="checkbox" name="input_ad9a8bd0276f496e83f265e9af49d0e1_2_1[]" id="input_ad9a8bd0276f496e83f265e9af49d0e1_2_1_choice_1" class="field-input input-checkbox" value="choice_1"/><label id="ad9a8bd0276f496e83f265e9af49d0e1_2_1-choice_1-label" for="input_ad9a8bd0276f496e83f265e9af49d0e1_2_1_choice_1" class="response-label field-label label-inline" aria-describedby="status_ad9a8bd0276f496e83f265e9af49d0e1_2_1 description_ad9a8bd0276f496e83f265e9af49d0e1_1_1"> A fusion reactor cannot &#8220;meltdown&#8221;
</label>
</div>
<div class="field">
<input type="checkbox" name="input_ad9a8bd0276f496e83f265e9af49d0e1_2_1[]" id="input_ad9a8bd0276f496e83f265e9af49d0e1_2_1_choice_2" class="field-input input-checkbox" value="choice_2"/><label id="ad9a8bd0276f496e83f265e9af49d0e1_2_1-choice_2-label" for="input_ad9a8bd0276f496e83f265e9af49d0e1_2_1_choice_2" class="response-label field-label label-inline" aria-describedby="status_ad9a8bd0276f496e83f265e9af49d0e1_2_1 description_ad9a8bd0276f496e83f265e9af49d0e1_1_1"> Fusion energy is very easy to generate on earth, and it is simple to translate fusion reactions from the laboratory to a power plant
</label>
</div>
<div class="field">
<input type="checkbox" name="input_ad9a8bd0276f496e83f265e9af49d0e1_2_1[]" id="input_ad9a8bd0276f496e83f265e9af49d0e1_2_1_choice_3" class="field-input input-checkbox" value="choice_3"/><label id="ad9a8bd0276f496e83f265e9af49d0e1_2_1-choice_3-label" for="input_ad9a8bd0276f496e83f265e9af49d0e1_2_1_choice_3" class="response-label field-label label-inline" aria-describedby="status_ad9a8bd0276f496e83f265e9af49d0e1_2_1 description_ad9a8bd0276f496e83f265e9af49d0e1_1_1"> Tritium is radioactive, but can be handled safely in a fusion power plant, as it is in many scientific and industrial applications
</label>
</div>
<span id="answer_ad9a8bd0276f496e83f265e9af49d0e1_2_1"/>
</fieldset>
<div class="indicator-container">
<span class="status unanswered" id="status_ad9a8bd0276f496e83f265e9af49d0e1_2_1" data-tooltip="Not yet answered.">
<span class="sr">unanswered</span><span class="status-icon" aria-hidden="true"/>
</span>
</div>
</div></div>
</div>
<div class="action">
<input type="hidden" name="problem_id" value="Assessment 3" />
<div class="submit-attempt-container">
<button type="button" class="submit btn-brand" data-submitting="Submitting" data-value="Submit" data-should-enable-submit-button="True" aria-describedby="submission_feedback_ad9a8bd0276f496e83f265e9af49d0e1" >
<span class="submit-label">Submit</span>
</button>
<div class="submission-feedback" id="submission_feedback_ad9a8bd0276f496e83f265e9af49d0e1">
<span class="sr">Some problems have options such as save, reset, hints, or show answer. These options follow the Submit button.</span>
</div>
</div>
<div class="problem-action-buttons-wrapper">
</div>
</div>
<div class="notification warning notification-gentle-alert
is-hidden"
tabindex="-1">
<span class="icon fa fa-exclamation-circle" aria-hidden="true"></span>
<span class="notification-message" aria-describedby="ad9a8bd0276f496e83f265e9af49d0e1-problem-title">
</span>
<div class="notification-btn-wrapper">
<button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button>
</div>
</div>
<div class="notification warning notification-save
is-hidden"
tabindex="-1">
<span class="icon fa fa-save" aria-hidden="true"></span>
<span class="notification-message" aria-describedby="ad9a8bd0276f496e83f265e9af49d0e1-problem-title">None
</span>
<div class="notification-btn-wrapper">
<button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button>
</div>
</div>
<div class="notification general notification-show-answer
is-hidden"
tabindex="-1">
<span class="icon fa fa-info-circle" aria-hidden="true"></span>
<span class="notification-message" aria-describedby="ad9a8bd0276f496e83f265e9af49d0e1-problem-title">Answers are displayed within the problem
</span>
<div class="notification-btn-wrapper">
<button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button>
</div>
</div>
</div>
"
data-graded="True">
<p class="loading-spinner">
<i class="fa fa-spinner fa-pulse fa-2x fa-fw"></i>
<span class="sr">Loading…</span>
</p>
</div>
</div>
</div>
<div class="vert vert-3" data-id="block-v1:MITx+22.011x+3T2018+type@problem+block@0a3bc282fd0943d3919d0b294ac1a643">
<div class="xblock xblock-public_view xblock-public_view-problem xmodule_display xmodule_ProblemBlock" data-runtime-class="LmsRuntime" data-request-token="5678420a0d9611efa9690affe8bd68a3" data-usage-id="block-v1:MITx+22.011x+3T2018+type@problem+block@0a3bc282fd0943d3919d0b294ac1a643" data-runtime-version="1" data-course-id="course-v1:MITx+22.011x+3T2018" data-init="XBlockToXModuleShim" data-has-score="True" data-graded="True" data-block-type="problem">
<script type="json/xblock-args" class="xblock-json-init-args">
{"xmodule-type": "Problem"}
</script>
<div id="problem_0a3bc282fd0943d3919d0b294ac1a643" class="problems-wrapper" role="group"
aria-labelledby="0a3bc282fd0943d3919d0b294ac1a643-problem-title"
data-problem-id="block-v1:MITx+22.011x+3T2018+type@problem+block@0a3bc282fd0943d3919d0b294ac1a643" data-url="/courses/course-v1:MITx+22.011x+3T2018/xblock/block-v1:MITx+22.011x+3T2018+type@problem+block@0a3bc282fd0943d3919d0b294ac1a643/handler/xmodule_handler"
data-problem-score="0"
data-problem-total-possible="1"
data-attempts-used="0"
data-content="
<h3 class="hd hd-3 problem-header" id="0a3bc282fd0943d3919d0b294ac1a643-problem-title" aria-describedby="block-v1:MITx+22.011x+3T2018+type@problem+block@0a3bc282fd0943d3919d0b294ac1a643-problem-progress" tabindex="-1">
Assessment 4
</h3>
<div class="problem-progress" id="block-v1:MITx+22.011x+3T2018+type@problem+block@0a3bc282fd0943d3919d0b294ac1a643-problem-progress"></div>
<div class="problem">
<div>
<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 1" role="group"><div class="choicegroup capa_inputtype" id="inputtype_0a3bc282fd0943d3919d0b294ac1a643_2_1">
<fieldset aria-describedby="status_0a3bc282fd0943d3919d0b294ac1a643_2_1 description_0a3bc282fd0943d3919d0b294ac1a643_1_1">
<legend id="0a3bc282fd0943d3919d0b294ac1a643_2_1-legend" class="response-fieldset-legend field-group-hd">Which of the following sentences are true?</legend>
<p class="question-description" id="description_0a3bc282fd0943d3919d0b294ac1a643_1_1">Choose all that apply. </p>
<div class="field">
<input type="checkbox" name="input_0a3bc282fd0943d3919d0b294ac1a643_2_1[]" id="input_0a3bc282fd0943d3919d0b294ac1a643_2_1_choice_0" class="field-input input-checkbox" value="choice_0"/><label id="0a3bc282fd0943d3919d0b294ac1a643_2_1-choice_0-label" for="input_0a3bc282fd0943d3919d0b294ac1a643_2_1_choice_0" class="response-label field-label label-inline" aria-describedby="status_0a3bc282fd0943d3919d0b294ac1a643_2_1 description_0a3bc282fd0943d3919d0b294ac1a643_1_1"> The only direct products of a \(D-T\) fusion reaction are a neutron and helium
</label>
</div>
<div class="field">
<input type="checkbox" name="input_0a3bc282fd0943d3919d0b294ac1a643_2_1[]" id="input_0a3bc282fd0943d3919d0b294ac1a643_2_1_choice_1" class="field-input input-checkbox" value="choice_1"/><label id="0a3bc282fd0943d3919d0b294ac1a643_2_1-choice_1-label" for="input_0a3bc282fd0943d3919d0b294ac1a643_2_1_choice_1" class="response-label field-label label-inline" aria-describedby="status_0a3bc282fd0943d3919d0b294ac1a643_2_1 description_0a3bc282fd0943d3919d0b294ac1a643_1_1"> Fusion plasmas have generated more fusion power out than power put in
</label>
</div>
<div class="field">
<input type="checkbox" name="input_0a3bc282fd0943d3919d0b294ac1a643_2_1[]" id="input_0a3bc282fd0943d3919d0b294ac1a643_2_1_choice_2" class="field-input input-checkbox" value="choice_2"/><label id="0a3bc282fd0943d3919d0b294ac1a643_2_1-choice_2-label" for="input_0a3bc282fd0943d3919d0b294ac1a643_2_1_choice_2" class="response-label field-label label-inline" aria-describedby="status_0a3bc282fd0943d3919d0b294ac1a643_2_1 description_0a3bc282fd0943d3919d0b294ac1a643_1_1"> A criterion for a self-sustaining fusion plasma is called the Lawson Criterion
</label>
</div>
<div class="field">
<input type="checkbox" name="input_0a3bc282fd0943d3919d0b294ac1a643_2_1[]" id="input_0a3bc282fd0943d3919d0b294ac1a643_2_1_choice_3" class="field-input input-checkbox" value="choice_3"/><label id="0a3bc282fd0943d3919d0b294ac1a643_2_1-choice_3-label" for="input_0a3bc282fd0943d3919d0b294ac1a643_2_1_choice_3" class="response-label field-label label-inline" aria-describedby="status_0a3bc282fd0943d3919d0b294ac1a643_2_1 description_0a3bc282fd0943d3919d0b294ac1a643_1_1"> Fusion fuel is such a high density fuel that a pickup truck of \(D\) and \(T\) could be used to power a city like Boston, MA, for a year
</label>
</div>
<span id="answer_0a3bc282fd0943d3919d0b294ac1a643_2_1"/>
</fieldset>
<div class="indicator-container">
<span class="status unanswered" id="status_0a3bc282fd0943d3919d0b294ac1a643_2_1" data-tooltip="Not yet answered.">
<span class="sr">unanswered</span><span class="status-icon" aria-hidden="true"/>
</span>
</div>
</div></div>
</div>
<div class="action">
<input type="hidden" name="problem_id" value="Assessment 4" />
<div class="submit-attempt-container">
<button type="button" class="submit btn-brand" data-submitting="Submitting" data-value="Submit" data-should-enable-submit-button="True" aria-describedby="submission_feedback_0a3bc282fd0943d3919d0b294ac1a643" >
<span class="submit-label">Submit</span>
</button>
<div class="submission-feedback" id="submission_feedback_0a3bc282fd0943d3919d0b294ac1a643">
<span class="sr">Some problems have options such as save, reset, hints, or show answer. These options follow the Submit button.</span>
</div>
</div>
<div class="problem-action-buttons-wrapper">
</div>
</div>
<div class="notification warning notification-gentle-alert
is-hidden"
tabindex="-1">
<span class="icon fa fa-exclamation-circle" aria-hidden="true"></span>
<span class="notification-message" aria-describedby="0a3bc282fd0943d3919d0b294ac1a643-problem-title">
</span>
<div class="notification-btn-wrapper">
<button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button>
</div>
</div>
<div class="notification warning notification-save
is-hidden"
tabindex="-1">
<span class="icon fa fa-save" aria-hidden="true"></span>
<span class="notification-message" aria-describedby="0a3bc282fd0943d3919d0b294ac1a643-problem-title">None
</span>
<div class="notification-btn-wrapper">
<button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button>
</div>
</div>
<div class="notification general notification-show-answer
is-hidden"
tabindex="-1">
<span class="icon fa fa-info-circle" aria-hidden="true"></span>
<span class="notification-message" aria-describedby="0a3bc282fd0943d3919d0b294ac1a643-problem-title">Answers are displayed within the problem
</span>
<div class="notification-btn-wrapper">
<button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button>
</div>
</div>
</div>
"
data-graded="True">
<p class="loading-spinner">
<i class="fa fa-spinner fa-pulse fa-2x fa-fw"></i>
<span class="sr">Loading…</span>
</p>
</div>
</div>
</div>
</div>
</div>
© All Rights Reserved