Question

During a collision between a photon and an electron, there is conservation of

(A) energy, only

(B) momentum, only

(C) both energy and momentum

(D) neither energy nor momentum

As a photon loses energy during a collision, its wavelength

(A) decreases

(B) increases

(C) remains the same

Answer 1

During a collision between a photon and an electron, there is conservation of

(C) both energy and momentum

the collision between a photon and an electron is considered to be perfectly elastic and both momentum and energy are conserved.

As a photon loses energy during a collision, its wavelength

(A) increases

The energy of a photon is given by the relation, E = hc/λ

Where, h- Planck’s constant

                c-speed of light

                λ- wavelength

it is clear that a decrease in energy results in increase of wavelength.