Structure of Atom

Consider a helium (He) atom that absorbs a photon of wavelength 330nm. The change in the velocity ( in cms−1) of He atom after the photon absorption is (Assume : Momentum is conserved when photon is absorbed.
Use : Planck constant =6.6×10−34Js, Avogadro number =6×1023mol−1, Molar mass of He=4gmol−1 )