The radiation pressure exerted by a 450 W light source on a…

Physics Oscillations and Waves Electromagnetic Waves Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: September 12, 2026

The radiation pressure exerted by a 450 W light source on a perfectly reflecting surface placed at 2 m away from it, is

Pascals

Text Solution

Verified by Experts

The correct answer is:

First, the intensity at a distance from a point light source spreading its energy isotropically is given by

Where

So,

For a perfectly reflecting surface, the radiation pressure is given by

where is the speed of light.
Substituting the value of :

Calculating the final value:

which is approximately .

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