Which statement correctly describes the nature of radioactive decay for a sample of unstable nuclei?
The rate of decay can be significantly increased by raising the temperature of the sample.
The process is random and spontaneous, so it is impossible to predict exactly when an individual nucleus will decay.
The decay only affects the outer-shell electrons of the atom, leaving the nucleus unchanged.
The individual nuclei always decay in a fixed, predictable sequence.
120 exam-style questions on CIE IGCSE Physics 5.2.3a Radioactive decay. Each one has a worked solution and a mark scheme showing where the marks go.