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6.5 Uses and dangers of radioactivity

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Question 25
F

The Figure shows the inside of a household smoke alarm.

Figure

image

a.

Give the type of radiation emitted by americium-241.

[1]
b.

Describe how the radiation from the source causes a small current in the air gap.

[2]
c.

The alarm sounds when the current falls.

Explain why the alarm sounds when smoke enters the air gap.

[2]
d.

Explain why the radiation from the source is not a danger to people in the room.

[2]
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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