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Solution


Q.

Given below are two statements: One is labelled as Assertion (A) and 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:          [2025]
1 (A) is true but (R) is false.  
2 (A) is false but (R) is true.  
3 Both (A) and (R) are true but (R) is not the correct explanation of (A).  
4 Both (A) and (R) are true and (R) is the correct explanation of (A).  

Ans.

(2)

EM wave carry both energy and momentum. Restmass of photon is zero.