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<h2 class="hd hd-2 unit-title">1.1.1. Video Lecture</h2>
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Your browser does not support this video format. Try using a different browser.
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<div class="vcr"><div class="vidtime">0:00 / 0:00</div></div>
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<h3 class="hd hd-4 downloads-heading sr" id="video-download-transcripts_fab3202f5a734cdf93f40b1c352fc966">Downloads and transcripts</h3>
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<h4 class="hd hd-5">Transcripts</h4>
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<a class="btn btn-link" href="/courses/course-v1:MITx+22.011x+3T2018/xblock/block-v1:MITx+22.011x+3T2018+type@video+block@fab3202f5a734cdf93f40b1c352fc966/handler/transcript/download" data-value="srt">Download SubRip (.srt) file</a>
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<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@fab3202f5a734cdf93f40b1c352fc966/handler/transcript/download" data-value="txt">Download Text (.txt) file</a>
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<h2 class="hd hd-2 unit-title">1.1.1. Required Assessment</h2>
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Assessment 1
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<legend id="70ad9d02484d4c1383a880d444ebebba_2_1-legend" class="response-fieldset-legend field-group-hd">Which of the following are considered ionizing radiation?</legend>
<p class="question-description" id="description_70ad9d02484d4c1383a880d444ebebba_1_1">Choose all that apply </p>
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<input type="checkbox" name="input_70ad9d02484d4c1383a880d444ebebba_2_1[]" id="input_70ad9d02484d4c1383a880d444ebebba_2_1_choice_4" class="field-input input-checkbox" value="choice_4"/><label id="70ad9d02484d4c1383a880d444ebebba_2_1-choice_4-label" for="input_70ad9d02484d4c1383a880d444ebebba_2_1_choice_4" class="response-label field-label label-inline" aria-describedby="status_70ad9d02484d4c1383a880d444ebebba_2_1 description_70ad9d02484d4c1383a880d444ebebba_1_1"> Gamma rays
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<input type="checkbox" name="input_70ad9d02484d4c1383a880d444ebebba_2_1[]" id="input_70ad9d02484d4c1383a880d444ebebba_2_1_choice_5" class="field-input input-checkbox" value="choice_5"/><label id="70ad9d02484d4c1383a880d444ebebba_2_1-choice_5-label" for="input_70ad9d02484d4c1383a880d444ebebba_2_1_choice_5" class="response-label field-label label-inline" aria-describedby="status_70ad9d02484d4c1383a880d444ebebba_2_1 description_70ad9d02484d4c1383a880d444ebebba_1_1"> Radio waves from a cell phone
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