A) alpha and beta rays simultaneously
B) beta and gamma rays simultaneously
C) gamma and alpha rays
D) gamma rays only
Correct Answer: D
Solution :
Key Idea: \[\alpha \] rays are nucleus of He atom, \[\beta \]rays are electrons and \[\gamma \] rays are energy particles. A radioactive substance first emits \[\alpha \] and \[\beta \]particles. Now it becomes excited. In order to come down to ground state, it now emits \[\gamma \] particle. \[\therefore \] Radioactive substance cannot emit \[\gamma \] rays only. They will always be emitted after \[\alpha \] or \[\beta \] emission.
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