An isotope can exist in two nuclear arrangements, P and Q.
| nuclear arrangement | number of protons | number of neutrons | energy above the lowest-energy arrangement / J |
|---|---|---|---|
| P | 47 | 62 | 2.8 × 10⁻¹³ |
| Q | 47 | 62 | 0.9 × 10⁻¹³ |
A nucleus changes from arrangement P to arrangement Q and emits radiation.
Explain why these data are evidence that the radiation emitted is gamma radiation.
Calculate the energy carried away by the gamma radiation.