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Radioactivity (A-level only)

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Question 1

Two radioactive nuclides, R R\,R and SSS, have half-lives of 5.0 minutes5.0\text{ minutes}5.0 minutes and 10.0 minutes10.0\text{ minutes}10.0 minutes, respectively. Two freshly prepared samples of R R\,R and S S\,S start decaying at the same time. After 30 minutes30\text{ minutes}30 minutes, the number of radioactive nuclei in both samples is the same. The sample of S S\,S initially contained N N\,N radioactive nuclei. What was the initial number of radioactive nuclei in the sample of RRR?

A

4N4N4N

B

8N8N8N

C

16N16N16N

D

32N32N32N

Markscheme

Radioactivity (A-level only) Questions

  1. A Level
  2. /Physics
  3. /Radioactivity (A-level only)

128 exam-style questions on AQA A Level Physics Radioactivity (A-level only), covering Rutherford scattering (A-level only), $\alpha$ , $\beta$ and $\gamma$ radiation (A-level only), Radioactive decay (A-level only), Nuclear instability (A-level only), Nuclear radius (A-level only), Mass and energy (A-level only), Induced fission (A-level only), and Safety aspects (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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