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6.5 Uses and dangers of radioactivity

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Question 18
F

A radioactive sample has an initial activity of 640 Bq640\ \mathrm{Bq}640 Bq and a half-life of 3 hours. A laboratory procedure requires it to remain in secure storage until its activity is 40 Bq40\ \mathrm{Bq}40 Bq or less. What is the minimum storage time?

[1]
A

151515 hours

B

999 hours

C

121212 hours

D

666 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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