Question

By using photons of specific wavelengths, chemists can dissociategaseous H-I to produce H atoms with accurately known speeds. WhenH-I dissociates, the H atoms move away rapidly, whereas therelatively heavy I atoms move little. Average Bond Energies
(a) What is the longest wavelength (in nm) that can dissociate amolecule of H-I?
(b) If a photon of 253 nm is used, what is the excess energy (in J)over that needed for the dissociation?
(c) If all of this excess energy is carried away by the H atom askinetic energy, what is its speed (in m/s)?