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Which consequence results when metastable barium-137m undergoes isomeric transition?

A)Emission of a gamma photon
B)Conversion to barium–137 cation
C)Emission of an alpha particle
D)Spontaneous fission into lighter nuclides

💡 Explanation

Emission of a gamma photon occurs through isomeric transition. This electromagnetic decay occurs because the nucleus releases energy, reaching a lower energy state via photon emission rather than particle emission or fission, therefore retaining the barium-137 identity.

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