Let E ₀ and B ₀ denote the amplitude of electric and magnetic field of a plane electromagnetic wave in air. The magnitude of the average momentum transferred per unit area and per unit time to a totally absorbing surface is

Step-by-step solution

Intensity of electromagnetic wave, I= 1 2 ₀ E₀^2 c= 1 2 B₀^2 c ₀ where, B₀= electric field and c= speed of light. Now, momentum transfer per unit area per unit time, which is also called radiation pressure. gathered 1 A ( p t )= I c = 1 2 ₀ E₀^2 c c I c = 1 2 ₀ E₀^2 gathered [where, p= momentum transferred, t= time and A= area.]