A photon of light scatters off an electron which is initially at rest. After the

Question

A photon of light scatters off an electron which is initially at rest. After the collision

A. the wavelength of the photon and the momentum of the electron are greater than before the collision

B. the photon reflects off the electron so that is now going in the opposite direction to its original velocity, and the electron remains at rest.

C. the energy of the photon is less than before the collisoon, while its momentum is unchanged.

D. the wavelength and momentum of the photon are less than before the collision.

Explanation / Answer

The photon loses some of its energy. so its wavelength increases . The electron which was initially at rest ahs some velocity . so the momentum of the electron increases.So  the wavelength of the photon and the momentum of the electron are greater than before the collision. Thus option (a) is correct.

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