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10 December, 21:15

An atom of 90/38 Sr decays by gamma decay. which atom is left after the decay?

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  1. 11 December, 00:21
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    90/38 Sr

    Explanation:

    Gamma decay involves rearrangements in an atomic nucleus usually following a nuclear change. When a nuclear change occurs, the daughter nuclei is in excited state, a high energy state. The nucleons quickly rearrange themselves and rapidly lower the energy of the daughter nucleus. The corresponding amount of excited state energy is emitted as the daughter nuclei return to ground state as short range, high energy electromagnetic gamma rays.

    Hence, the number of nucleons in the nucleus remain the same before and after a gamma decay.
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