CAIE A-Level Physics A2 23.2.1 Fluctuations in Count Rate Provide Evidence for the Random Nature of

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Carbon-15 $\left({ }_{6}^{15} \mathrm{C}\right)$ is an isotope of carbon that undergoes radioactive decay to nitrogen-15 $\left({ }_{7}^{15} \mathrm{~N}\right)$ , which is a stable isotope of nitrogen.

Radioactive decay is both a random and a spontaneous process.

A small sample of carbon-15 decays. The mass M of carbon-15 in the sample decreases with time t.

Fig. 10.1 shows the variation with t of the value of $\ln \left(M / 10^{-16} \mathrm{~g}\right)$ .

Fig. 10.1

State how Fig. 10.1 demonstrates that radioactive decay is random.

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CAIE A-Level Physics A2 23.2.1 Fluctuations in Count Rate Provide Evidence for the Random Nature of Topic Practice

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