Question

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Electromagnetic waves carry energy but not momentum.
Reason (R): Mass of a photon is zero. In the light of the above statements, choose the most appropriate answer from the options given below:

• A. Both (A) and (R) are true and (R) is the correct explanation of (A)
• B. (A) is false but (R) is true
• C. Both (A) and (R) are true but (R) is not the correct explanation of (A)
• D. (A) is true but (R) is false

Hint:

Photons carry momentum despite having no rest mass, and their energy is related to their momentum.

Answer 1

The Correct Option is C

Assertion (A): Electromagnetic waves do carry energy and momentum, contrary to the statement.
Reason (R): The mass of a photon is indeed zero, but this does not mean photons do not carry momentum. Photons have momentum due to their energy E = hν, which is related to their frequency ν.