The frequency of a light beam is doubled. Which one of the following is correct for the momentum of the photons in that beam of light?
A) It stays the same.
B) It is halved.
C) It is doubled.
D) It is reduced by one-fourth
E) It is quadrupled.

Question

Quizplus · Accepted Answer

The momentum of a photon is given by p = h/λ, where h is Planck's constant and λ is the wavelength of the photon. Doubling the frequency of the light beam means halving the wavelength of the photon. Therefore, the momentum of the photon will double.

The Frequency of a Light Beam Is Doubled