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5.2.4a Half-life

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Question 28

A radioactive isotope has a half-life of 15 years.

A sample of the material initially contains 1.6 × 1011 atoms.

How many atomic nuclei have decayed after 45 years?

A

2.0×10102.0 \times 10^{10}2.0×1010

B

8.0×10108.0 \times 10^{10}8.0×1010

C

1.2×10111.2 \times 10^{11}1.2×1011

D

1.4×10111.4 \times 10^{11}1.4×1011

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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