All Problems

Thermal Radiation. Quantum Nature of Light.

Problem 5.263

A short light pulse of energy \(E=7.5\) J falls in the form of a narrow and almost parallel beam on a mirror plate whose reflection coefficient is \(\rho=0.60 .\) The angle of incidence is \(30^{\circ} .\) In terms of the corpuscular theory find the momentum transferred to the plate.

Reveal Answer
p=(E/c)1+ρ2+2ρcos2θ=35nNsp=(E / c) \sqrt{1+\rho^{2}+2 \rho \cos 2 \theta}=35 \mathrm{nN} \cdot \mathrm{s}