An individual nucleus of a radioactive isotope is observed within a sample. Which statement correctly describes when this specific nucleus will decay?
It will decay exactly when one half-life of the isotope has elapsed.
It is impossible to predict when this particular nucleus will decay because radioactive decay is a random process.
It will decay sooner if the temperature of the sample is increased.
It is more likely to decay first if it is near the outer surface of the sample.
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.