Which of the following statements are correct ?

Options

A. In many `alpha` decay process, `gamma -` radiation is emitted
B. the nuclear isomers produces by `gamma -` ray bombardment have the same atomic and mass number but differ in their life-times ( except that the ground states may be stable ) .
C. The wavelength and absolute magnitude of the difference between the spins of the initial and final states are the same for `gamma -` and X - rays.
D. A nucleus in an excited state may give up its excitation energy and return to the ground state by the emission of electromagnetic `gamma -` radiation.

Answer

A, B, C, D