A hydrogen atom in its ground state is immersed in a continuous spectrum of ultraviolet light with wavelengths ranging from 96 nm to 110 nm. After absorbing a photon, the atom emits one or more photons to return to the ground state.
(a) What wavelength(s) can be absorbed by the H atom?
(b) For each of the possibilities in (a), if the atom is at rest before absorbing the UV photon, what is its recoil speed after absorption (but before emitting any photons)?
(c) For each of the possibilities in (a), how many different ways are there for the atom to return to the ground state?