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Thermal Radiation. Quantum Nature of Light.

Problem 5.263

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

Reveal Answer
p=(E/c)1+ρ2+2ρcos⁡2θ=35nN⋅sp=(E / c) \sqrt{1+\rho^{2}+2 \rho \cos 2 \theta}=35 \mathrm{nN} \cdot \mathrm{s}
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