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6.5 Uses and dangers of radioactivity

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Question 12

Two deposits of gamma-emitting radioactive material, X and Y, are found in soil after separate incidents. When they are found, each deposit contains the same number of undecayed nuclei. Material X has a half-life of 2 years and material Y has a half-life of 200 years.

Which statement about deposits X and Y, at the time they are found, is correct?

[1]
A

Y has the greater activity; X will remain a radiation hazard for longer.

B

X has the greater activity; Y will remain a radiation hazard for longer.

C

X and Y have the same activity; Y will remain a radiation hazard for longer.

D

X has the greater activity; X will remain a radiation hazard for longer.

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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