Which statement about the random decay of carbon-14 nuclei in a sample is correct?
The probability of a carbon-14 nucleus decaying during a one-hour interval is the same for all carbon-14 nuclei in the sample.
The probability of a nucleus decaying in the next second is higher for older nuclei than for newly formed ones.
The probability of an individual nucleus decaying per unit time decreases as the total number of undecayed carbon-14 nuclei in the sample decreases.
The probability of a nucleus decaying in a given interval increases with temperature.
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.