WAEC Physics 2018 Paper

Concept:Natural radioactivity is the spontaneous emission of radiation from an unstable nucleus.It can involve $\alpha$-particles, $\beta$-particles, or $\gamma$-rays.Explanation:During natural radioactive decay, an unstable nucleus may emit $\alpha$-particles or $\beta$-particles.These emissions can also be accompanied by $\gamma$-rays.X-rays are not a natural emission from the nucleus in radioactive decay.They are produced by external atomic processes, not by natural radioactivity.Therefore, the only option that correctly lists natural radioactive emissions is the one containing $\alpha$-particles and $\beta$-particles.Answer:A. $\alpha$-particles and $\beta$-particles