Which of the following statements about radioactive decay is correct?
Heating a radioactive substance increases its rate of decay.
It is impossible to predict which individual nucleus in a sample will decay next.
Chemical reactions can change the half-life of a radioactive isotope.
The radioactive decay of a nucleus depends on how many other nuclei have already decayed.
484 exam-style questions on CIE IGCSE Physics 5.2 Radioactivity, covering 5.2.1 Background radiation and measuring count rate, 5.2.2a Alpha, beta and gamma emission, 5.2.2b Deflection and ionising effects of nuclear radiation, 5.2.3a Radioactive decay, 5.2.3b Effects of decay on the nucleus and decay equations, 5.2.4a Half-life, 5.2.4b Choosing isotopes for applications, and 5.2.5 Effects of ionising radiation and safety precautions. Each one has a worked solution and a mark scheme showing where the marks go.