Radiation of energy E is incident on complete reflecting surface.Momentum imparted to surface will be……

Options

A. `(E )/(c )`
B. `(2E)/(c )`
C. Ec
D. `(E )/(c^(2))`

Answer

B

Explanation

Momentum of incident photon `p_(1)=(E )/(c )`
Momentum of reflected photon `p_(2)=(E )/(c )`
Momentum imparted to surface =-change in momentum,
`(-2E)/(c )`=-change in momentum of surface
`therefore` Momentum imparted to surface =`(2E)/(c )`