Recall Planck's constant equals 6.63 a 10^-34 j.s and the speed of light is 3.00 x 10^8 m/s. Calculate the...

Recall Planck's constant equals 6.63 a 10^-34 j.s and the speed of light is 3.00 x 10^8 m/s. Calculate the wavelength in nm of a photon emitted by a hydrogen atome when its electron drops from the n=4 state to the n=3 state.