Question

A plane electromagnetic wave is incident on a plane surface of area a normally and is perfectly reflected. Lf energy e strike the surface in time t then average pressure exerted on surface is

Answer 1

Answer:

The answer will be  1/c de/dt/A

Explanation:

According to the problem the wave is incident on the area. Let the area be A

Therefore we can say that,

p = 2e/c

Now from this we can also say that if the pressure exerted by the wave be B

then B = F/A

             = 1/A (dp/dt)

             = 1/A (d/dt)(2e/c)

             = 1/c  de/dt/A

Hence the average pressure exerted on the surface is 1/c de/dt/A