Energy of electron after collision isa.its acquired kinetic energyb.sum of its rest mass energy and kinetic energyc.its rest mass energy

The energy of an electron after a collision can be described by option b. It is the sum of its rest mass energy and kinetic energy.

Here's the step-by-step explanation:

1. Rest Mass Energy: This is the energy of an electron due to its mass, according to Einstein's equation E=mc^2, where E is energy, m is mass, and c is the speed of light. For an electron, this is approximately 0.511 MeV.

2. Kinetic Energy: This is the energy an electron has due to its motion. It is given by the equation KE = 1/2 mv^2, where m is mass and v is velocity. After a collision, the electron may have gained or lost kinetic energy depending on the specifics of the collision.

3. Total Energy: The total energy of the electron after the collision is the sum of its rest mass energy and its kinetic energy. This is because energy is conserved in collisions, so any energy not accounted for in the rest mass must be present as kinetic energy.

So, the energy of an electron after a collision is the sum of its rest mass energy and kinetic energy.