It is not possible for a photon to be completely absorbed by a free electron. Explain.

Explanation

If the i undergoes an elastic collision with a photon, there applies an energy conservation to the collision.
We get , ` hc/ lambda + m_0c^(2) = mc^(2) `
and applying conservation of momentum ` h / lambda = mV`
Mass of e `m_0 / (sqrt 1 - v_0 / c^(2)) `
from above eqaution it can be easily shown that
` V - c = l `
or ` V =0`
both of these results have no physical meaning hence it is not possible for a photon to be completely absorbed by a free electron.