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6 Radioactivity

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Question 74
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 Radioactivity Questions

  1. GCSE
  2. /Physics
  3. /6 Radioactivity

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