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<h2 class="hd hd-2 unit-title">3.1.2. Notes & Additional Material</h2>
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<p><strong>Use the following links to download this lecture's notes:</strong></p>
<p><a href="/assets/courseware/v1/8e867bb8fd777c8d2d06e5496acfaa50/asset-v1:MITx+22.011x+3T2018+type@asset+block/Unit_3.1.2_required_pdf_lecture_notes__vf.pdf" target="[object Object]">Lecture 3.1.2. [Basics of Nuclear Fusion] - Required Lecture Notes</a></p>
<p><a href="/assets/courseware/v1/09cc2366f1c98a31d204d3e1c227f42a/asset-v1:MITx+22.011x+3T2018+type@asset+block/Unit_3.1.2_optional_pdf_lecture_notes__vf_.pdf" target="[object Object]">Lecture 3.1.2. [Basics of Nuclear Fusion] - Optional Lecture Notes</a></p>
<p><strong>Use the following link to access a paper about cold fusion (Physics Today):</strong></p>
<p><a href="/assets/courseware/v1/c2b2a923e09e5da3e078acc86c6d416e/asset-v1:MITx+22.011x+3T2018+type@asset+block/Unit_3.1.2_optional_paper_to_read_cold_fusion_PhysicsToday_article_1989_copy.pdf" target="[object Object]">Optional reading: "Fusion in a Flask: Expert DOE Panel Throws Cold Water on Utah Discovery" (article from Physics Today, 1989)</a></p>
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<h2 class="hd hd-2 unit-title">3.1.2 Required Assessment</h2>
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Assessment 1
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<input type="checkbox" name="input_9406f6cda0ab45f5aff24e620e824eec_2_1[]" id="input_9406f6cda0ab45f5aff24e620e824eec_2_1_choice_1" class="field-input input-checkbox" value="choice_1"/><label id="9406f6cda0ab45f5aff24e620e824eec_2_1-choice_1-label" for="input_9406f6cda0ab45f5aff24e620e824eec_2_1_choice_1" class="response-label field-label label-inline" aria-describedby="status_9406f6cda0ab45f5aff24e620e824eec_2_1 description_9406f6cda0ab45f5aff24e620e824eec_1_1"> At scales the size of atoms and molecules the Coulomb force is stronger than gravity
</label>
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<input type="checkbox" name="input_9406f6cda0ab45f5aff24e620e824eec_2_1[]" id="input_9406f6cda0ab45f5aff24e620e824eec_2_1_choice_2" class="field-input input-checkbox" value="choice_2"/><label id="9406f6cda0ab45f5aff24e620e824eec_2_1-choice_2-label" for="input_9406f6cda0ab45f5aff24e620e824eec_2_1_choice_2" class="response-label field-label label-inline" aria-describedby="status_9406f6cda0ab45f5aff24e620e824eec_2_1 description_9406f6cda0ab45f5aff24e620e824eec_1_1"> The protons in a nucleus feel the Coulomb force and will try repel each other
</label>
</div>
<div class="field">
<input type="checkbox" name="input_9406f6cda0ab45f5aff24e620e824eec_2_1[]" id="input_9406f6cda0ab45f5aff24e620e824eec_2_1_choice_3" class="field-input input-checkbox" value="choice_3"/><label id="9406f6cda0ab45f5aff24e620e824eec_2_1-choice_3-label" for="input_9406f6cda0ab45f5aff24e620e824eec_2_1_choice_3" class="response-label field-label label-inline" aria-describedby="status_9406f6cda0ab45f5aff24e620e824eec_2_1 description_9406f6cda0ab45f5aff24e620e824eec_1_1"> A neutron does not feel the Coulomb force because it has no electric charge
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Assessment 3
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<legend id="11182f805f8f497a890c14f9895e1601_2_1-legend" class="response-fieldset-legend field-group-hd">The strong nuclear force keeps protons and neutrons together in an atom. Which of the following statements is correct?</legend>
<p class="question-description" id="description_11182f805f8f497a890c14f9895e1601_1_1">Select only one option </p>
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<input type="radio" name="input_11182f805f8f497a890c14f9895e1601_2_1" id="input_11182f805f8f497a890c14f9895e1601_2_1_choice_0" class="field-input input-radio" value="choice_0"/><label id="11182f805f8f497a890c14f9895e1601_2_1-choice_0-label" for="input_11182f805f8f497a890c14f9895e1601_2_1_choice_0" class="response-label field-label label-inline" aria-describedby="status_11182f805f8f497a890c14f9895e1601_2_1 description_11182f805f8f497a890c14f9895e1601_1_1"> The strong nuclear force is about 100 times larger than the Coulomb force at atomic scales
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<input type="radio" name="input_11182f805f8f497a890c14f9895e1601_2_1" id="input_11182f805f8f497a890c14f9895e1601_2_1_choice_1" class="field-input input-radio" value="choice_1"/><label id="11182f805f8f497a890c14f9895e1601_2_1-choice_1-label" for="input_11182f805f8f497a890c14f9895e1601_2_1_choice_1" class="response-label field-label label-inline" aria-describedby="status_11182f805f8f497a890c14f9895e1601_2_1 description_11182f805f8f497a890c14f9895e1601_1_1"> The strong nuclear force is about 100 times smaller than the Coulomb force at atomic scales
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<input type="radio" name="input_11182f805f8f497a890c14f9895e1601_2_1" id="input_11182f805f8f497a890c14f9895e1601_2_1_choice_2" class="field-input input-radio" value="choice_2"/><label id="11182f805f8f497a890c14f9895e1601_2_1-choice_2-label" for="input_11182f805f8f497a890c14f9895e1601_2_1_choice_2" class="response-label field-label label-inline" aria-describedby="status_11182f805f8f497a890c14f9895e1601_2_1 description_11182f805f8f497a890c14f9895e1601_1_1"> Electrons are in the nucleus of an atom and are held there by the strong nuclear force
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<input type="radio" name="input_11182f805f8f497a890c14f9895e1601_2_1" id="input_11182f805f8f497a890c14f9895e1601_2_1_choice_3" class="field-input input-radio" value="choice_3"/><label id="11182f805f8f497a890c14f9895e1601_2_1-choice_3-label" for="input_11182f805f8f497a890c14f9895e1601_2_1_choice_3" class="response-label field-label label-inline" aria-describedby="status_11182f805f8f497a890c14f9895e1601_2_1 description_11182f805f8f497a890c14f9895e1601_1_1"> A neutron will experience both the strong nuclear force and the Coulomb force
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Assessment 4
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<legend id="53d71f6af23245c8948c8beb86c0e58e_2_1-legend" class="response-fieldset-legend field-group-hd">Once quantum tunneling effects are taken into account, the energies that nuclei require in order to overcome the Coulomb force of repulsion due to their positive charges is what order of magnitude?</legend>
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<input type="radio" name="input_53d71f6af23245c8948c8beb86c0e58e_2_1" id="input_53d71f6af23245c8948c8beb86c0e58e_2_1_choice_0" class="field-input input-radio" value="choice_0"/><label id="53d71f6af23245c8948c8beb86c0e58e_2_1-choice_0-label" for="input_53d71f6af23245c8948c8beb86c0e58e_2_1_choice_0" class="response-label field-label label-inline" aria-describedby="status_53d71f6af23245c8948c8beb86c0e58e_2_1 description_53d71f6af23245c8948c8beb86c0e58e_1_1"> \(1 eV \)
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<input type="radio" name="input_53d71f6af23245c8948c8beb86c0e58e_2_1" id="input_53d71f6af23245c8948c8beb86c0e58e_2_1_choice_1" class="field-input input-radio" value="choice_1"/><label id="53d71f6af23245c8948c8beb86c0e58e_2_1-choice_1-label" for="input_53d71f6af23245c8948c8beb86c0e58e_2_1_choice_1" class="response-label field-label label-inline" aria-describedby="status_53d71f6af23245c8948c8beb86c0e58e_2_1 description_53d71f6af23245c8948c8beb86c0e58e_1_1"> \(10 eV \)
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<input type="radio" name="input_53d71f6af23245c8948c8beb86c0e58e_2_1" id="input_53d71f6af23245c8948c8beb86c0e58e_2_1_choice_2" class="field-input input-radio" value="choice_2"/><label id="53d71f6af23245c8948c8beb86c0e58e_2_1-choice_2-label" for="input_53d71f6af23245c8948c8beb86c0e58e_2_1_choice_2" class="response-label field-label label-inline" aria-describedby="status_53d71f6af23245c8948c8beb86c0e58e_2_1 description_53d71f6af23245c8948c8beb86c0e58e_1_1"> \(100 keV \)
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<input type="radio" name="input_53d71f6af23245c8948c8beb86c0e58e_2_1" id="input_53d71f6af23245c8948c8beb86c0e58e_2_1_choice_3" class="field-input input-radio" value="choice_3"/><label id="53d71f6af23245c8948c8beb86c0e58e_2_1-choice_3-label" for="input_53d71f6af23245c8948c8beb86c0e58e_2_1_choice_3" class="response-label field-label label-inline" aria-describedby="status_53d71f6af23245c8948c8beb86c0e58e_2_1 description_53d71f6af23245c8948c8beb86c0e58e_1_1"> \(1 TeV (e.g. 10^12 eV) \)
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Assessment 5
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<legend id="b27685a8564c4b4a8afec2cfa4f5771b_2_1-legend" class="response-fieldset-legend field-group-hd">A particle at room temperature would on average have what value of kinetic energy?</legend>
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<input type="radio" name="input_b27685a8564c4b4a8afec2cfa4f5771b_2_1" id="input_b27685a8564c4b4a8afec2cfa4f5771b_2_1_choice_2" class="field-input input-radio" value="choice_2"/><label id="b27685a8564c4b4a8afec2cfa4f5771b_2_1-choice_2-label" for="input_b27685a8564c4b4a8afec2cfa4f5771b_2_1_choice_2" class="response-label field-label label-inline" aria-describedby="status_b27685a8564c4b4a8afec2cfa4f5771b_2_1 description_b27685a8564c4b4a8afec2cfa4f5771b_1_1"> \(10 keV \)
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<input type="radio" name="input_b27685a8564c4b4a8afec2cfa4f5771b_2_1" id="input_b27685a8564c4b4a8afec2cfa4f5771b_2_1_choice_3" class="field-input input-radio" value="choice_3"/><label id="b27685a8564c4b4a8afec2cfa4f5771b_2_1-choice_3-label" for="input_b27685a8564c4b4a8afec2cfa4f5771b_2_1_choice_3" class="response-label field-label label-inline" aria-describedby="status_b27685a8564c4b4a8afec2cfa4f5771b_2_1 description_b27685a8564c4b4a8afec2cfa4f5771b_1_1"> \(1 MeV \)
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Assessment 6
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<legend id="5ac8b986e0594202b8e4511fd4a54350_2_1-legend" class="response-fieldset-legend field-group-hd">What physical process is important for enabling fusion reactions?</legend>
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<input type="radio" name="input_5ac8b986e0594202b8e4511fd4a54350_2_1" id="input_5ac8b986e0594202b8e4511fd4a54350_2_1_choice_0" class="field-input input-radio" value="choice_0"/><label id="5ac8b986e0594202b8e4511fd4a54350_2_1-choice_0-label" for="input_5ac8b986e0594202b8e4511fd4a54350_2_1_choice_0" class="response-label field-label label-inline" aria-describedby="status_5ac8b986e0594202b8e4511fd4a54350_2_1 description_5ac8b986e0594202b8e4511fd4a54350_1_1"> Gravitational attraction
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<input type="radio" name="input_5ac8b986e0594202b8e4511fd4a54350_2_1" id="input_5ac8b986e0594202b8e4511fd4a54350_2_1_choice_1" class="field-input input-radio" value="choice_1"/><label id="5ac8b986e0594202b8e4511fd4a54350_2_1-choice_1-label" for="input_5ac8b986e0594202b8e4511fd4a54350_2_1_choice_1" class="response-label field-label label-inline" aria-describedby="status_5ac8b986e0594202b8e4511fd4a54350_2_1 description_5ac8b986e0594202b8e4511fd4a54350_1_1"> Quantum tunneling
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<input type="radio" name="input_5ac8b986e0594202b8e4511fd4a54350_2_1" id="input_5ac8b986e0594202b8e4511fd4a54350_2_1_choice_2" class="field-input input-radio" value="choice_2"/><label id="5ac8b986e0594202b8e4511fd4a54350_2_1-choice_2-label" for="input_5ac8b986e0594202b8e4511fd4a54350_2_1_choice_2" class="response-label field-label label-inline" aria-describedby="status_5ac8b986e0594202b8e4511fd4a54350_2_1 description_5ac8b986e0594202b8e4511fd4a54350_1_1"> Neutron capture
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Assessment 7
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<p class="question-description" id="description_b44de49e087b4fe88cde820107c88618_1_1">Select only one option </p>
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<input type="radio" name="input_b44de49e087b4fe88cde820107c88618_2_1" id="input_b44de49e087b4fe88cde820107c88618_2_1_choice_0" class="field-input input-radio" value="choice_0"/><label id="b44de49e087b4fe88cde820107c88618_2_1-choice_0-label" for="input_b44de49e087b4fe88cde820107c88618_2_1_choice_0" class="response-label field-label label-inline" aria-describedby="status_b44de49e087b4fe88cde820107c88618_2_1 description_b44de49e087b4fe88cde820107c88618_1_1"> the particles must be found in the sun or in some other star
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<input type="radio" name="input_b44de49e087b4fe88cde820107c88618_2_1" id="input_b44de49e087b4fe88cde820107c88618_2_1_choice_1" class="field-input input-radio" value="choice_1"/><label id="b44de49e087b4fe88cde820107c88618_2_1-choice_1-label" for="input_b44de49e087b4fe88cde820107c88618_2_1_choice_1" class="response-label field-label label-inline" aria-describedby="status_b44de49e087b4fe88cde820107c88618_2_1 description_b44de49e087b4fe88cde820107c88618_1_1"> the particles must have no charge so that they avoid the Coulomb force of repulsion
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<input type="radio" name="input_b44de49e087b4fe88cde820107c88618_2_1" id="input_b44de49e087b4fe88cde820107c88618_2_1_choice_2" class="field-input input-radio" value="choice_2"/><label id="b44de49e087b4fe88cde820107c88618_2_1-choice_2-label" for="input_b44de49e087b4fe88cde820107c88618_2_1_choice_2" class="response-label field-label label-inline" aria-describedby="status_b44de49e087b4fe88cde820107c88618_2_1 description_b44de49e087b4fe88cde820107c88618_1_1"> the particles must have large amounts of energy to overcome the Coulomb force of repulsion because they both have positive charge
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<input type="radio" name="input_b44de49e087b4fe88cde820107c88618_2_1" id="input_b44de49e087b4fe88cde820107c88618_2_1_choice_3" class="field-input input-radio" value="choice_3"/><label id="b44de49e087b4fe88cde820107c88618_2_1-choice_3-label" for="input_b44de49e087b4fe88cde820107c88618_2_1_choice_3" class="response-label field-label label-inline" aria-describedby="status_b44de49e087b4fe88cde820107c88618_2_1 description_b44de49e087b4fe88cde820107c88618_1_1"> the particles must have opposite charge so that the Coulomb force combines them
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