Some radioactive nucleus may emit.

Options

A. Only one `alpha, beta` or `gamma` at a time.
B. All the three `alpha, beta` and `gamma` one after another.
C. All the three `alpha, beta` and `gamma` simultaneously
D. Only `alpha` and `beta` simultaneously

Answer

A

Explanation

(a) No radioactive substance emit both `alpha` and `beta` particles simultaneously. Some substance emit `alpha-`particles and some other emits `beta-`particles. `gamma-`rays are emitted along with both `alpha` and `beta`-particles.