Question

In a photon-electron collision ___________.

• A. Only total energy is conserved
• B. Only total momentum is conserved
• C. Both total energy and total momentum are conserved
• D. Both total momentum and total energy are not conserved

Answer 1

The correct option is C Both total energy and total momentum are conserved

In a photon-electron collision both total energy and total momentum are conserved. As in the case of compton effect, when a photon with some energy collides with a stationary electron, some of the energy and momentum is transferred to the electron but both energy and momentum are conserved in this elastic collision.
Option C