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<h2 class="hd hd-2 unit-title">1.2.2. Video Lecture</h2>
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<div class="focus_grabber last"></div>
<h3 class="hd hd-4 downloads-heading sr" id="video-download-transcripts_110fef9070c24384addfaf5152484a70">Downloads and transcripts</h3>
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<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@110fef9070c24384addfaf5152484a70/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@110fef9070c24384addfaf5152484a70/handler/transcript/download" data-value="txt">Download Text (.txt) file</a>
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<h2 class="hd hd-2 unit-title">1.2.2. Required Assessment</h2>
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Assessment 1
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<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 1" role="group"><div class="choicegroup capa_inputtype" id="inputtype_eaa059b255084d54b8fd782135e15aea_2_1">
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<legend id="eaa059b255084d54b8fd782135e15aea_2_1-legend" class="response-fieldset-legend field-group-hd">What is the probability of observing a beta particle at exactly its Q-value, or the total nuclear reaction energy?</legend>
<p class="question-description" id="description_eaa059b255084d54b8fd782135e15aea_1_1">Select only one option</p>
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<div class="field">
<input type="radio" name="input_eaa059b255084d54b8fd782135e15aea_2_1" id="input_eaa059b255084d54b8fd782135e15aea_2_1_choice_1" class="field-input input-radio" value="choice_1"/><label id="eaa059b255084d54b8fd782135e15aea_2_1-choice_1-label" for="input_eaa059b255084d54b8fd782135e15aea_2_1_choice_1" class="response-label field-label label-inline" aria-describedby="status_eaa059b255084d54b8fd782135e15aea_2_1 description_eaa059b255084d54b8fd782135e15aea_1_1"> \(25\%\)
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<div class="field">
<input type="radio" name="input_eaa059b255084d54b8fd782135e15aea_2_1" id="input_eaa059b255084d54b8fd782135e15aea_2_1_choice_2" class="field-input input-radio" value="choice_2"/><label id="eaa059b255084d54b8fd782135e15aea_2_1-choice_2-label" for="input_eaa059b255084d54b8fd782135e15aea_2_1_choice_2" class="response-label field-label label-inline" aria-describedby="status_eaa059b255084d54b8fd782135e15aea_2_1 description_eaa059b255084d54b8fd782135e15aea_1_1"> \(50\%\)
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<div class="field">
<input type="radio" name="input_eaa059b255084d54b8fd782135e15aea_2_1" id="input_eaa059b255084d54b8fd782135e15aea_2_1_choice_3" class="field-input input-radio" value="choice_3"/><label id="eaa059b255084d54b8fd782135e15aea_2_1-choice_3-label" for="input_eaa059b255084d54b8fd782135e15aea_2_1_choice_3" class="response-label field-label label-inline" aria-describedby="status_eaa059b255084d54b8fd782135e15aea_2_1 description_eaa059b255084d54b8fd782135e15aea_1_1"> \(75\%\)
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<input type="radio" name="input_eaa059b255084d54b8fd782135e15aea_2_1" id="input_eaa059b255084d54b8fd782135e15aea_2_1_choice_4" class="field-input input-radio" value="choice_4"/><label id="eaa059b255084d54b8fd782135e15aea_2_1-choice_4-label" for="input_eaa059b255084d54b8fd782135e15aea_2_1_choice_4" class="response-label field-label label-inline" aria-describedby="status_eaa059b255084d54b8fd782135e15aea_2_1 description_eaa059b255084d54b8fd782135e15aea_1_1"> \(100\%\)
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<span class="status unanswered" id="status_eaa059b255084d54b8fd782135e15aea_2_1" data-tooltip="Not yet answered.">
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Assessment 2
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<legend id="40a1dbea547f41e680d1d625e8589565_2_1-legend" class="response-fieldset-legend field-group-hd">What is the minimum threshold energy required for beta-minus (electron) decay to occur?</legend>
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<input type="radio" name="input_40a1dbea547f41e680d1d625e8589565_2_1" id="input_40a1dbea547f41e680d1d625e8589565_2_1_choice_1" class="field-input input-radio" value="choice_1"/><label id="40a1dbea547f41e680d1d625e8589565_2_1-choice_1-label" for="input_40a1dbea547f41e680d1d625e8589565_2_1_choice_1" class="response-label field-label label-inline" aria-describedby="status_40a1dbea547f41e680d1d625e8589565_2_1 description_40a1dbea547f41e680d1d625e8589565_1_1"> \(1 keV\)
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<div class="field">
<input type="radio" name="input_40a1dbea547f41e680d1d625e8589565_2_1" id="input_40a1dbea547f41e680d1d625e8589565_2_1_choice_2" class="field-input input-radio" value="choice_2"/><label id="40a1dbea547f41e680d1d625e8589565_2_1-choice_2-label" for="input_40a1dbea547f41e680d1d625e8589565_2_1_choice_2" class="response-label field-label label-inline" aria-describedby="status_40a1dbea547f41e680d1d625e8589565_2_1 description_40a1dbea547f41e680d1d625e8589565_1_1"> \(511 keV\)
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<input type="radio" name="input_40a1dbea547f41e680d1d625e8589565_2_1" id="input_40a1dbea547f41e680d1d625e8589565_2_1_choice_3" class="field-input input-radio" value="choice_3"/><label id="40a1dbea547f41e680d1d625e8589565_2_1-choice_3-label" for="input_40a1dbea547f41e680d1d625e8589565_2_1_choice_3" class="response-label field-label label-inline" aria-describedby="status_40a1dbea547f41e680d1d625e8589565_2_1 description_40a1dbea547f41e680d1d625e8589565_1_1"> \(1000 keV\)
</label>
</div>
<div class="field">
<input type="radio" name="input_40a1dbea547f41e680d1d625e8589565_2_1" id="input_40a1dbea547f41e680d1d625e8589565_2_1_choice_4" class="field-input input-radio" value="choice_4"/><label id="40a1dbea547f41e680d1d625e8589565_2_1-choice_4-label" for="input_40a1dbea547f41e680d1d625e8589565_2_1_choice_4" class="response-label field-label label-inline" aria-describedby="status_40a1dbea547f41e680d1d625e8589565_2_1 description_40a1dbea547f41e680d1d625e8589565_1_1"> \(1022 keV\)
</label>
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<span id="answer_40a1dbea547f41e680d1d625e8589565_2_1"/>
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Assessment 3
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<div class="problem-progress" id="block-v1:MITx+22.011x+3T2018+type@problem+block@a6fe3b4bc8a1452cbbdcc974b93277d4-problem-progress"></div>
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<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 1" role="group"><div class="choicegroup capa_inputtype" id="inputtype_a6fe3b4bc8a1452cbbdcc974b93277d4_2_1">
<fieldset aria-describedby="status_a6fe3b4bc8a1452cbbdcc974b93277d4_2_1 description_a6fe3b4bc8a1452cbbdcc974b93277d4_1_1">
<legend id="a6fe3b4bc8a1452cbbdcc974b93277d4_2_1-legend" class="response-fieldset-legend field-group-hd">What is the minimum threshold energy required for beta-plus (positron) decay to occur?</legend>
<p class="question-description" id="description_a6fe3b4bc8a1452cbbdcc974b93277d4_1_1">Select only one option</p>
<div class="field">
<input type="radio" name="input_a6fe3b4bc8a1452cbbdcc974b93277d4_2_1" id="input_a6fe3b4bc8a1452cbbdcc974b93277d4_2_1_choice_0" class="field-input input-radio" value="choice_0"/><label id="a6fe3b4bc8a1452cbbdcc974b93277d4_2_1-choice_0-label" for="input_a6fe3b4bc8a1452cbbdcc974b93277d4_2_1_choice_0" class="response-label field-label label-inline" aria-describedby="status_a6fe3b4bc8a1452cbbdcc974b93277d4_2_1 description_a6fe3b4bc8a1452cbbdcc974b93277d4_1_1"> \(0 keV\)
</label>
</div>
<div class="field">
<input type="radio" name="input_a6fe3b4bc8a1452cbbdcc974b93277d4_2_1" id="input_a6fe3b4bc8a1452cbbdcc974b93277d4_2_1_choice_1" class="field-input input-radio" value="choice_1"/><label id="a6fe3b4bc8a1452cbbdcc974b93277d4_2_1-choice_1-label" for="input_a6fe3b4bc8a1452cbbdcc974b93277d4_2_1_choice_1" class="response-label field-label label-inline" aria-describedby="status_a6fe3b4bc8a1452cbbdcc974b93277d4_2_1 description_a6fe3b4bc8a1452cbbdcc974b93277d4_1_1"> \(1 keV\)
</label>
</div>
<div class="field">
<input type="radio" name="input_a6fe3b4bc8a1452cbbdcc974b93277d4_2_1" id="input_a6fe3b4bc8a1452cbbdcc974b93277d4_2_1_choice_2" class="field-input input-radio" value="choice_2"/><label id="a6fe3b4bc8a1452cbbdcc974b93277d4_2_1-choice_2-label" for="input_a6fe3b4bc8a1452cbbdcc974b93277d4_2_1_choice_2" class="response-label field-label label-inline" aria-describedby="status_a6fe3b4bc8a1452cbbdcc974b93277d4_2_1 description_a6fe3b4bc8a1452cbbdcc974b93277d4_1_1"> \(511 keV\)
</label>
</div>
<div class="field">
<input type="radio" name="input_a6fe3b4bc8a1452cbbdcc974b93277d4_2_1" id="input_a6fe3b4bc8a1452cbbdcc974b93277d4_2_1_choice_3" class="field-input input-radio" value="choice_3"/><label id="a6fe3b4bc8a1452cbbdcc974b93277d4_2_1-choice_3-label" for="input_a6fe3b4bc8a1452cbbdcc974b93277d4_2_1_choice_3" class="response-label field-label label-inline" aria-describedby="status_a6fe3b4bc8a1452cbbdcc974b93277d4_2_1 description_a6fe3b4bc8a1452cbbdcc974b93277d4_1_1"> \(1000 keV\)
</label>
</div>
<div class="field">
<input type="radio" name="input_a6fe3b4bc8a1452cbbdcc974b93277d4_2_1" id="input_a6fe3b4bc8a1452cbbdcc974b93277d4_2_1_choice_4" class="field-input input-radio" value="choice_4"/><label id="a6fe3b4bc8a1452cbbdcc974b93277d4_2_1-choice_4-label" for="input_a6fe3b4bc8a1452cbbdcc974b93277d4_2_1_choice_4" class="response-label field-label label-inline" aria-describedby="status_a6fe3b4bc8a1452cbbdcc974b93277d4_2_1 description_a6fe3b4bc8a1452cbbdcc974b93277d4_1_1"> \(1022 keV\)
</label>
</div>
<span id="answer_a6fe3b4bc8a1452cbbdcc974b93277d4_2_1"/>
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Assessment 4
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<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 1" role="group"><div class="choicegroup capa_inputtype" id="inputtype_43e7a332bd684eb0b0e28b115a4325ad_2_1">
<fieldset aria-describedby="status_43e7a332bd684eb0b0e28b115a4325ad_2_1 description_43e7a332bd684eb0b0e28b115a4325ad_1_1">
<legend id="43e7a332bd684eb0b0e28b115a4325ad_2_1-legend" class="response-fieldset-legend field-group-hd">Electron capture competes with ________ in radioactive decay.</legend>
<p class="question-description" id="description_43e7a332bd684eb0b0e28b115a4325ad_1_1">Select only one option</p>
<div class="field">
<input type="radio" name="input_43e7a332bd684eb0b0e28b115a4325ad_2_1" id="input_43e7a332bd684eb0b0e28b115a4325ad_2_1_choice_0" class="field-input input-radio" value="choice_0"/><label id="43e7a332bd684eb0b0e28b115a4325ad_2_1-choice_0-label" for="input_43e7a332bd684eb0b0e28b115a4325ad_2_1_choice_0" class="response-label field-label label-inline" aria-describedby="status_43e7a332bd684eb0b0e28b115a4325ad_2_1 description_43e7a332bd684eb0b0e28b115a4325ad_1_1"> Alpha decay
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<input type="radio" name="input_43e7a332bd684eb0b0e28b115a4325ad_2_1" id="input_43e7a332bd684eb0b0e28b115a4325ad_2_1_choice_1" class="field-input input-radio" value="choice_1"/><label id="43e7a332bd684eb0b0e28b115a4325ad_2_1-choice_1-label" for="input_43e7a332bd684eb0b0e28b115a4325ad_2_1_choice_1" class="response-label field-label label-inline" aria-describedby="status_43e7a332bd684eb0b0e28b115a4325ad_2_1 description_43e7a332bd684eb0b0e28b115a4325ad_1_1"> Beta-minus (electron) decay
</label>
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<input type="radio" name="input_43e7a332bd684eb0b0e28b115a4325ad_2_1" id="input_43e7a332bd684eb0b0e28b115a4325ad_2_1_choice_2" class="field-input input-radio" value="choice_2"/><label id="43e7a332bd684eb0b0e28b115a4325ad_2_1-choice_2-label" for="input_43e7a332bd684eb0b0e28b115a4325ad_2_1_choice_2" class="response-label field-label label-inline" aria-describedby="status_43e7a332bd684eb0b0e28b115a4325ad_2_1 description_43e7a332bd684eb0b0e28b115a4325ad_1_1"> Beta-plus (positron) decay
</label>
</div>
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<input type="radio" name="input_43e7a332bd684eb0b0e28b115a4325ad_2_1" id="input_43e7a332bd684eb0b0e28b115a4325ad_2_1_choice_3" class="field-input input-radio" value="choice_3"/><label id="43e7a332bd684eb0b0e28b115a4325ad_2_1-choice_3-label" for="input_43e7a332bd684eb0b0e28b115a4325ad_2_1_choice_3" class="response-label field-label label-inline" aria-describedby="status_43e7a332bd684eb0b0e28b115a4325ad_2_1 description_43e7a332bd684eb0b0e28b115a4325ad_1_1"> Gamma decay
</label>
</div>
<div class="field">
<input type="radio" name="input_43e7a332bd684eb0b0e28b115a4325ad_2_1" id="input_43e7a332bd684eb0b0e28b115a4325ad_2_1_choice_4" class="field-input input-radio" value="choice_4"/><label id="43e7a332bd684eb0b0e28b115a4325ad_2_1-choice_4-label" for="input_43e7a332bd684eb0b0e28b115a4325ad_2_1_choice_4" class="response-label field-label label-inline" aria-describedby="status_43e7a332bd684eb0b0e28b115a4325ad_2_1 description_43e7a332bd684eb0b0e28b115a4325ad_1_1"> Spontaneous fission
</label>
</div>
<span id="answer_43e7a332bd684eb0b0e28b115a4325ad_2_1"/>
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