A-level Physics · Radioactivity

Radioactive decay activity

Turn a half-life into a decay constant, then find the activity after a given time.

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Question 1

A sample of a radioactive isotope has a half-life of 5 days. The initial activity of the sample is 9.7×1079.7 \times 10^{7} Bq. Calculate the activity of the sample after 19 days. Give your answer to 3 significant figures.

Bq

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

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