a) Compute the energy in joules per quantum, joules per mole and electron volts of photons of wavelength 122 nm.
b) The radioactive lifetime of a hydrogen atom in its first excited level (2p) is 1.6x10-9 s. Define what is the Einstein a coefficient for spontaneous emission?
c) Explain what is the line width in cm-1 of the emission line from the 2p level of H atom?