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5.2.4a Half-life

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Question 42

A radioactive source has a half-life of 3 days.

A detector near the source shows an initial reading of $24\,000\,$ counts per minute.

Background radiation can be ignored.

What is the reading on the detector 9 days later?

A

$3000$ counts per minute

B

$6000$ counts per minute

C

$8000$ counts per minute

D

$00012\,000$ counts per minute

Markscheme

5.2.4a Half-life Questions

IGCSE
Physics
5.2.4a Half-life

144 exam-style questions on CIE IGCSE Physics 5.2.4a Half-life. Each one has a worked solution and a mark scheme showing where the marks go.

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