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:

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Photons carry momentum despite having no rest mass, and their energy is related to their momentum.
Updated On: Mar 18, 2025
  • Both (A) and (R) are true and (R) is the correct explanation of (A)
  • (A) is false but (R) is true
  • Both (A) and (R) are true but (R) is not the correct explanation of (A)
  • (A) is true but (R) is false
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The Correct Option is C

Solution and Explanation

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.

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