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6.5 Uses and dangers of radioactivity

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Question 31

A technician measures the activity of a sample of a radioactive tracer used in an industrial process. The activity is 720 Bq720\ \mathrm{Bq}720 Bq when the sample is first measured and 90 Bq90\ \mathrm{Bq}90 Bq when it is measured again 12 hours later. The activity changes only because of radioactive decay.

What is the half-life of the tracer?

[1]
A

1.51.51.5 hours

B

444 hours

C

666 hours

D

333 hours

Markscheme

6.5 Uses and dangers of radioactivity Questions

  1. GCSE
  2. /Physics
  3. /6.5 Uses and dangers of radioactivity

97 exam-style questions on Edexcel GCSE Physics 6.5 Uses and dangers of radioactivity, covering 6.5.1 Uses of radioactivity, 6.5.2 Dangers of ionising radiation and precautions, 6.5.3 Half-life and radiation dangers, 6.5.4 Safety precautions for radiation exposure, and 6.5.5 Contamination and irradiation. Each one has a worked solution and a mark scheme showing where the marks go.

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