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5.2 Radioactivity

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Question 113

A radioactive source is placed 30 mm in front of a detector.

The count rate from the source is 1500 counts/minute1500\text{ counts/minute}1500 counts/minute.

With a thin sheet of paper between the source and the detector, the count rate is 900 counts/minute900\text{ counts/minute}900 counts/minute.

With the paper removed and a sheet of aluminium 5 mm thick placed between the source and the detector, the count rate is 0 counts/minute0\text{ counts/minute}0 counts/minute.

Which radioactive emissions are coming from the source?

A

alpha and beta only

B

alpha and gamma only

C

beta and gamma only

D

alpha, beta, and gamma

Markscheme

5.2 Radioactivity Questions

  1. IGCSE
  2. /Physics
  3. /5.2 Radioactivity

484 exam-style questions on CIE IGCSE Physics 5.2 Radioactivity, covering 5.2.1 Background radiation and measuring count rate, 5.2.2a Alpha, beta and gamma emission, 5.2.2b Deflection and ionising effects of nuclear radiation, 5.2.3a Radioactive decay, 5.2.3b Effects of decay on the nucleus and decay equations, 5.2.4a Half-life, 5.2.4b Choosing isotopes for applications, and 5.2.5 Effects of ionising radiation and safety precautions. Each one has a worked solution and a mark scheme showing where the marks go.

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