A) nucleus
B) outermost shell of nucleus
C) innermost shell of nucleus
D) none of the above
Correct Answer: A
Solution :
When an alpha or a beta decay takes place, the daughter nucleus is generally formed in one of its excited states eventually comes to its ground state by emitting a photon or photons of electromagnetic radiation. The process of a nucleus coming down to a lower energy level by emitting a photon is called gamma decay. Hence, y-rays are originated from excited nucleus.
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