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Radioactive .27^60Co is transformed into...

Radioactive `._27^60Co` is transformed into stable `._28^60`Ni by emitting two `gamma`-rays of energies

A

1.33 MeV and 1.17 MeV in succession

B

1.17 MeV and 1.33 MeV in succession

C

1.37 MeV and 1.13 MeV in succession

D

1.13 MeV and 1.37 MeV in succession

Text Solution

Verified by Experts

The correct Answer is:
b
The successive emission of gamma rays of energies 1.17 MeV and 1.33 MeV from the de-excitation of `._28^60Ni` nuclei formed from `beta`-decay of `._27^60Co`. This process is shown in the figure through an energy level diagram .
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