When a photon is emitted by a hydrogen atom, the photon carries a momentum with it.

(a) Calculate the momentum carried by the photon when a hydrogen atom emits light of wavelength 656.3 nm

(b) With what speed does the atom recoil during this transition? Take the mass of the hydrogen atom = 1.67 × 10^–27 kg.

(c) Find the kinetic energy of recoil of the atom.