WBJEE 2013 Physics Solved Paper

The stopping potential for photoelect ons from a metal surface is V1 when monochromatic light of frequency v1 is incident on it. The stopping potential becomes V2 when monochromatic light of another frequency is incident on the same metal surface. Ifh be the Planck’s onstant and e be the charge of an electron, then the frequency of light in the second case is