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6.5 Uses and dangers of radioactivity

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Question 5
F

An ionisation smoke alarm contains an alpha source. Smoke enters the gap between its electrodes and removes ions from the air. Which sequence causes the alarm to sound?

[1]
A

More charge carriers; larger current; alarm operates

B

Fewer charge carriers; smaller current; alarm operates

C

Fewer charge carriers; larger current; alarm operates

D

More charge carriers; smaller current; alarm operates

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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