Question

radiation pressure p and energy density u is related by​

Answer 1

Answer:

Photons carry momentum h/λ and hence exert pressure. Pressure is rate of change of momentum (i.e. force) per unit area. ... The rate of arrival of momentum per unit area is nhc/λ=nhν. But hν is the energy of each photon, so the rate of arrival of momentum per unit area is equal to the energy density.