Radioactive uranium-238 decays to thorium-234 by the emission of a particle.
92238U→90234Th+particle {}^{238}_{92}\text{U} \rightarrow {}^{234}_{90}\text{Th} + \text{particle} 92238U→90234Th+particleWhich particle has been emitted in this process?
a β\betaβ-particle
an α\alphaα-particle
a neutron
a proton
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.