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

Options

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

Answer

B

Explanation

The successive emission of gamma rays of energies 1.17 MeV and 1.33 MeV from the de excitation of `""_(28)^(60)Ni` nuclei formed from `beta^(-)` decay of `""_(27)^(60)Co`. This process is as shown in the figure through an energy level diagram.