A photon of 300 nm is absorbed by a gas and then reemitted two photons. One of the reemitted photon has wavelenght 496 nm, then the other photon has
2.625 x 10-19 J
E = 6.625 × 10−34 3 × 108300 × 10−9
= 6.625 × 10−19 J
E1 = 4.007 × 10−19J
E2 = 6.625 × 10−19 − 4.007 × 10−19
= 2.618 × 10−19J