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:

Question

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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.

Answer

Both (A) and (R) are true and (R) is the correct explanation of (A)

Answer

(A) is false but (R) is true

Answer

Both (A) and (R) are true but (R) is not the correct explanation of (A)

Answer

(A) is true but (R) is false

List-I EM-Wave	List-II Wavelength Range
(A) Infra-red	(III) 1 mm to 700 nm
(B) Ultraviolet	(II) 400 nm to 1 nm
(C) X-rays	(IV) 1 nm to \(10^{-3}\) nm
(D) Gamma rays	(I) \(<10^{-3}\) nm

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The Correct Option is C

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