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Radioactivity and Half-Life Practice Questions

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20.3Radioactivity and Half-Life

Radioactivity and Half-Life Revision Questions

1. Calculate the kinetic energy (in electronvolts, eV) of an alpha particle emitted during a radioactive decay if it leaves the parent nucleus at 16 000 km/s. Take the mass of proton and neutron as mp = 1.6726 × 10-27 kg and mn = 1.6749 × 10-27 kg respectively. (1 eV = 1.6 × 10-19 J)

  1. 8.57 MeV
  2. 85 696 eV
  3. 18.67 eV
  4. 5.356 MeV

Correct Answer: D

2. What is the number of radioactive Radon-220 nuclei still undecayed after two minutes in a sample if initially there were 240 nuclei in the sample?

  1. 47
  2. 193
  3. 20
  4. 220

Correct Answer: A

3. What is the actual decay rate to the nearest whole number (in nuclei/year) of a Carbon-14 sample that contains 920 000 nuclei?

  1. 637 560 nuclei/year
  2. 111 nuclei/year
  3. 5730 nuclei/year
  4. 161 nuclei/year

Correct Answer: B

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