A free atom of iron emits Kα X-rays of energy 6.4 keV. Calculate the recoil kinetic energy of the atom. Mass of an iron atom = 9.3 x 10 -26 kg.
Here energy of photon = E
E = 6.4 KeV = 6.4 x103 ev
Momentum of Photon
According to collision theory of momentum of photon = momentum of atom
