A photon of wavelength 0.54500 nm strikes a free electron that is initially at rest. The photon is scattered straight backward. What is the speed of the recoil electron after the collision?

Question

anonymous · Answer

$$\sqrt{2hc/m(1/\lambda - 1/\lambda _{p })}$$

anonymous · Answer

i believe this is the correct final formula but i keep missing it

anonymous · Answer

what is $$\lambda and  \lambda _{p}$$ ?

ujjwal · Answer

Do you have the wavelength of photon which is scattered backward?

ghazi · Answer

well photon never scatters back..it is packet of energy ..therefore it transfers its energy to the electron and if electron gets minimum threshold energy, ti comes out of surface with a low energy photon which may or may not lie in visible range..(compton effect)..so i don't understand how photon is scattered here..thank you