Define mass defect and write its relation to binding energy.
Question 3
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A nucleus has mass defect \(0.0250\,\mathrm u\). Find its binding energy in MeV.
Question 4
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A nucleus has total binding energy \(160\,\mathrm{MeV}\) and \(A=20\). Find \(B/A\).
Question 5
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Why is binding energy per nucleon more useful than total binding energy when comparing nuclei?
Question 6
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Using atomic masses, write the mass defect for \(^{A}_{Z}X\) in terms of hydrogen atom mass, neutron mass, and atomic mass.
Question 7
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Calculate the binding energy of \(^{4}\mathrm{He}\) using \(m_{\mathrm H}=1.007825\,\mathrm u\), \(m_n=1.008665\,\mathrm u\), and atomic mass \(4.002603\,\mathrm u\).
Question 8
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Using the previous helium-4 binding energy \(28.3\,\mathrm{MeV}\), find its binding energy per nucleon.
Question 9
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A reaction increases total binding energy from \(180\,\mathrm{MeV}\) to \(190\,\mathrm{MeV}\). What energy is released?
Question 10
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Explain why a bound nucleus has less mass than its separated nucleons.
Question 11
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Convert \(5.0\,\mathrm{MeV}\) to joules.
Question 12
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A nucleus has \(Z=6\), \(N=6\), separated nucleon mass \(12.09894\,\mathrm u\), and nuclear mass \(12.00000\,\mathrm u\). Find \(B\).
Question 13
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In a graph of \(B/A\) against \(A\), why do fission and fusion both release energy in different regions?
Question 14
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Why must electron masses be handled carefully when using atomic masses for binding energy?
Question 15
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A nucleus has \(B/A=7.5\,\mathrm{MeV}\) and \(A=40\). Find its mass defect in atomic mass units.
Question 16
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A nucleus forms from separated nucleons and emits a \(2.0\,\mathrm{MeV}\) gamma ray. What mass change corresponds to the emitted energy?
Question 17
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Two possible products have the same \(A\), but product 1 has larger binding energy. Which product has smaller rest mass, and why?
Question 18
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Derive \(Q=B_f-B_i\) for a nuclear reaction involving the same total number of protons and neutrons before and after.
Question 19
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A proposed bound nucleus has calculated \(\Delta m<0\). Interpret the result.
Question 20
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Prove that energy release in a nuclear reaction corresponds to a decrease in total rest mass, not a loss of total energy.