Question

A radiation of energy E falls normally on a perfectly reflecting surface. The momentum transferred to the surface is:

(A) E/c 

(B) 2E/c 

(C) Ec 

(D) E/c² 

Answer 1

Correct option (B) 2E/c

Explanation:

Initial momentum of surface 

where c = velocity of light (constant). Since, the surface is perfectly reflecting so, the same momentum will be reflected completely Final momentum

Thus, momentum transferred to the surface is