If the total electromagnetic energy falling on a surface is `U` then the total momentum delivered (for complate absorption) is

Options

A. `(U)/(c)`
B. `cU`
C. `(U)/(c^(2))`
D. `c^(2)U`

Answer

A

Explanation

If the surface absorbs all the incident energy then thte total momentum delivered to the surface is
`p=(U)/(c)" (for complete absorption)"`
If the surface is a perfect reflector, then the total momentum delivered to the surface is
`p=(2U)/(c)" (for complete reflection)"`