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Question

Which of the following is false with respect to photons?

A
A photon always travels at a speed =3×108 m/s in vacuum (from any frame of reference used to observe the photon)
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B
Rest mass of a photon is zero.
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C
Total momentum and energy is conserved when a photon collides with material particle.
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D
Total number of photons, in all situations, is conserved.
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Solution

The correct option is D Total number of photons, in all situations, is conserved.
The photons may get absorbed and/or new photon may be emitted by any object or surface.

Thus, the total number of photons in a situation may not be conserved.

Hence, (D) is the correct answer.
Why this question?
This question tests basic knowledge of photon and light's particle nature.

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