A beam of ultraviolet radius hacking wavelength between `100nm and 200nm` is inclined on a sample of atomic hydrogen gas. Assuming that the atoms are in ground state which wavelength will have low intensity in the transmitted been? If the energy of a photon is equal to the ground state it hasl arge probability of being observed by on atom in the ground state

Answer

`[lambda_(1) = 122 nm; lambda_(2) = 103 nm]`