What is the momentum of a photon having the same total energy as an electron with a kinetic energy of 100 keV?
A)zero
B)611 keV/c
C)100 keV/c
D)211 keV/c
E)411 keV/c

Question

Quizplus · Accepted Answer

The momentum of a photon (p) is given by p = E/c, where E is the total energy of the photon and c is the speed of light. The total energy of a photon can be calculated using E = hf, where h is Planck's constant and f is the frequency of the photon. Equating the total energy of the photon to the kinetic energy of the electron, we get hf = 100 keV. Rearranging this equation, we get f = (100 keV)/h. Substituting this value of f into the equation for momentum, we get p = E/c = hf/c = [(100 keV)/h]/c = 611 keV/c. Therefore, the correct answer is B.

What Is the Momentum of a Photon Having the Same