Some radioactive nucleus may emit

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(A) radioactive nucleus undergoes decay by emitting either an $\alpha$-particle or a $\beta$-particle at a given time.It is physically impossible for

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Only one $\alpha, \beta$ or $\gamma$ at a time

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(A) radioactive nucleus undergoes decay by emitting either an $\alpha$-particle or a $\beta$-particle at a given time.It is physically impossible for a single nucleus to emit both $\alpha$ and $\beta$ particles simultaneously.However,$\gamma$-rays are often emitted as a result of the nucleus transitioning from an excited state to a lower energy state following the emission of an $\alpha$ or $\beta$ particle.Therefore,at any single instant,a nucleus emits only one type of particle ($\alpha$ or $\beta$),which may be accompanied by $\gamma$-radiation.

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