First slide

Quantum Theory of Light

Question

A radiation of energy E falls normally on a perfectly reflecting surface. The momentum transfer to the surface is

Moderate

A

E/c
B

2E/c
C

Ec
D

E/c²

Solution

We know that, $E = {mc}^{2}$
Further, momentum, p = mc= E/c
On reflection, momentum imparted to the surface
$= \frac{E_{1}}{c} - (- \frac{E}{c}) = \frac{2 E}{c}$

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