Question

3. Consider a neutron (mass 939.6 MeV/c2) with a kinetic energy of 2.0 MeV a) [2 points] is this non-relativistic, relativistic, or ultra-relativistic? Explain. b) [2 points] Find the neutron’s momentum c) [2 points] What is the neutron’s wavelength?

Answer 1

a) we know that

so,

rest mass energy of neutron is= 939.6 MeV

so,

so it is very near to one so the velocity is<< speed of light and it lies in nonrelativistic limit.

B) momentum of photon is

putting values we get

and wavelength is