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5.2.4a Half-life

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Question 38

The half-life for uranium-234 is 245,000 years245{,}000\text{ years}245,000 years.

A sample of uranium-234 produces 960 counts/s960\text{ counts/s}960 counts/s.

How long will it take for the count rate to drop to 120 counts/s120\text{ counts/s}120 counts/s?

A

490,000 years490{,}000\text{ years}490,000 years

B

735,000 years735{,}000\text{ years}735,000 years

C

980,000 years980{,}000\text{ years}980,000 years

D

1,960,000 years1{,}960{,}000\text{ years}1,960,000 years

Markscheme

5.2.4a Half-life Questions

  1. IGCSE
  2. /Physics
  3. /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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