If the wavelength of a light beam is doubled, what happens to the momentum of the photons in that light beam?
A) It stays the same.
B) It is reduced by one-fourth of its original value.
C) It is halved.
D) It is doubled.
E) It is increased to four times its original value.

Question

Quizplus · Accepted Answer

The momentum of a photon is given by the equation $p = \frac{h}{\lambda}$, where $p$ is the momentum, $h$ is Planck's constant, and $\lambda$ is the wavelength. If the wavelength is doubled, the momentum is halved, since they are inversely proportional.

If the Wavelength of a Light Beam Is Doubled, What