Questions
Question 1
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For the nuclide symbol \(^{A}_{Z}X\), state what \(A\), \(Z\), and \(N\) represent.
Question 2
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Find the number of protons and neutrons in \(^{238}_{92}\mathrm U\).
Question 3
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What is the charge of a nucleus with proton number \(Z=26\)?
Question 4
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Define isotopes and give the condition on \(Z\) and \(N\).
Question 5
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Using \(R=R_0A^{1/3}\), find the ratio of radii for nuclei with \(A=216\) and \(A=27\).
Question 6
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If \(R_0=1.2\,\mathrm{fm}\), estimate the radius of a nucleus with \(A=125\).
Question 7
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Show that the radius law \(R=R_0A^{1/3}\) implies nuclear volume is proportional to \(A\).
Question 8
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Use \(R=R_0A^{1/3}\) and \(M\approx Au\) to show that nuclear density is approximately independent of \(A\).
Question 9
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Estimate nuclear density using \(u=1.66\times10^{-27}\,\mathrm{kg}\) and \(R_0=1.2\times10^{-15}\,\mathrm m\).
Question 10
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A neutral atom has \(Z=17\) and \(A=35\). How many electrons, protons, and neutrons does it contain?
Question 11
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Explain the difference between isotopes and isobars.
Question 12
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An alpha particle is \(^{4}_{2}\mathrm{He}\). State its charge, proton number, neutron number, and nucleon number.
Question 13
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A nucleus has radius \(7.2\,\mathrm{fm}\) with \(R_0=1.2\,\mathrm{fm}\). Estimate \(A\).
Question 14
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Two nuclei have the same radius within a simple \(R=R_0A^{1/3}\) model. What can you infer about their mass numbers?
Question 15
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Why does the radius law support the idea that nucleons are packed with roughly constant separation?
Question 16
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A nuclide has \(N/Z=1.50\) and \(A=100\). Find \(Z\) and \(N\).
Question 17
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Explain why the atomic mass number \(A\) is close to, but not exactly equal to, the atomic mass in atomic mass units.
Question 18
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Show that doubling the nuclear radius increases the approximate nucleon number by a factor of \(8\).
Question 19
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A scattering experiment estimates a nuclear radius. Explain why high-energy probes are needed to resolve nuclear size.
Question 20
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Prove that if nuclear density is constant and nuclear mass is proportional to \(A\), then \(R\propto A^{1/3}\).