A-level Physics · Radioactive decay

Half-life from measurements

Find T½ from two activities and the time between them, with a background correction if needed.

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Question 1

The activity of a sample of a radioactive isotope falls from 7.5×1037.5 \times 10^{3} Bq to 7.88×1027.88 \times 10^{2} Bq in 39 days. Calculate the half-life of the isotope, in days. Give your answer to 3 significant figures.

days

You can type 4.53, 3.2e-5, 3.2 × 10^-5 or 7/3.

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