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

Question

Quizplus · Accepted Answer

Momentum of a photon is given by p= h/λ where h is Planck's constant and λ is the wavelength of the light. Doubling the wavelength means halving the momentum, hence the correct option is A) It is halved.

If the Wavelength of a Light Beam Is Doubled,what Happens