In the following express your answer in terms of eV/c and kg m/s. For photons, you may used the expression E=pc. Find the momentum of:
a) 10.0 MeV gamma ray
b) 25 keV X-ray
c) 1.0 micro m infrared photon
d) 150 MHz radio wave photon
a) Since a gamma ray is a photon, its momentum is given by p = E/c. Thus a 10.0 MeV gamma ray has a momentum of 10.0 MeV/c.
In this solution, we compute the energies of various photons of given wavelengths or frequencies.