The energy level diagram of $β^-$ emission from Cobalt is as shown. This diagram depicts the
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → emission of one $β^-$ particle and two gamma photons of different frequencies
Emission of one $β^-$ particle can be easily deduced by the diagram and two gamma photons of equal frequencies emitted because according to diagram energy gap between the two transitions seems almost equal and mass number cannot be changed by gamma photons also.