An isolated nucleus that is initially at rest emits a $\gamma$-ray photon with energy $0.51\,\text{MeV}$.
(a)[2]
State what the term photon means.
(b(i))[2]
For the $\gamma$-ray photon, determine its wavelength.
(b(ii))[2]
For the $\gamma$-ray photon, calculate its momentum.
(c(i))[2]
For this nucleus, determine the mass change $\Delta m$ during the decay that produces the energy of the $\gamma$-ray photon.
(c(ii))[1]
Explain why the nucleus is no longer at rest after the decay.
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