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5.2.4a Half-life

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Question 74

A radioactive isotope has a half-life of 45 minutes. The activity (number of emissions per second), $A$ , of a sample of this isotope is measured at a certain time. What was the activity of the sample 90 minutes earlier?

A

$A /4$

B

$A /2$

C

$2 A$

D

$4 A$

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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