Question

When the momentum of a photon is changed by an amount \( p' \), then the corresponding change in the de-Broglie wavelength is found to be 0.20%. Then, the original momentum of the photon was

• A. 300 p
• B. 500 p
• C. 400 p
• D. 100 p

Hint:

For photons, the de-Broglie wavelength is inversely proportional to momentum, so a small change in momentum results in a proportional change in wavelength.

Answer 1

The Correct Option is C

The change in de-Broglie wavelength is related to the change in momentum of the photon. By applying the appropriate relationship between momentum and wavelength, we can find the original momentum of the photon to be 400 p.