Which statement about β−\beta^-β− (beta-minus) decay is correct?
The nucleon number of the nucleus decreases by 1.
The atomic number of the nucleus increases by 1.
The nucleus changes into a different isotope of the same element.
The decay process ceases completely after exactly two half-lives have elapsed.
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.