Question

Derive an expression for radiation pressure in terms of intensity of radiation and velocity

Answer 1

Hey dear,

◆ Radiation pressure-

It is the pressure exerted upon any surface due to the exchange of momentum between the object and the electromagnetic field.

● Expression-

Let's consider

Φ = Intensity of radiation

c = speed of light

Radiation pressure is calculated by-

Pr = F / A

Pr = (1/A) dp/dt

But, dp = dU/c

Pr = (1/Ac) dU/dt

Pr = (1/c) dU/Adt

Now, putting Φ = dU/Adt

Pr = Φ / c

Hope this is useful...