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Q. $\gamma -$ rays are originated from

Delhi UMET/DPMTDelhi UMET/DPMT 2006Atoms

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 $\gamma -$ rays are originated from excited nucleus.