22.When is the gamma ray emitted? [A] When a nucleus in a ground state goes to the excited state [B] When a nucleus in an excited state spontaneously decays to its ground state [C] When alpha rays and beta rays collide [D] None of the above Show Answer
Gamma quanta are emitted when the nucleus passes to the ground state from the excited ones, which are formed either in the processes of alpha or beta decay, or in nuclear reactions. The energy spectrum of gamma radiation is always discrete.
