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5.2.1 Background radiation and measuring count rate

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Question 24

A radioactive source is placed near a detector connected to a counter.

360 counts are recorded by the counter in 4 minutes.

The background count rate is 25 counts per minute (cpm).

What is the corrected count rate for the radioactive source?

A

65 cpm65\text{ cpm}65 cpm

B

90 cpm90\text{ cpm}90 cpm

C

115 cpm115\text{ cpm}115 cpm

D

335 cpm335\text{ cpm}335 cpm

Markscheme

5.2.1 Background radiation and measuring count rate Questions

  1. IGCSE
  2. /Physics
  3. /5.2.1 Background radiation and measuring count rate

44 exam-style questions on CIE IGCSE Physics 5.2.1 Background radiation and measuring count rate. Each one has a worked solution and a mark scheme showing where the marks go.

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