Question

what will be the recoil velocity of an electron having kinetic energy of 6 MeV.​

Answer 1

Answer:

In the last expression, mp is the mass of a proton (i.e. the mass of the nucleus). The expression would get uglier if you used P=mv√1−v2c2 instead of P=mv. Using the above expression, the recoil velocity ends up being,vrecoil=10.2⋅10−5MeV938.272MeVc=3.26 ms.