An electromagnetic wave of intensity $I$ falls on a surface kept in vacuum and exerts radiation pressure $p$ on it. Which of the following are true?

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Radiation pressure is $I / c$ if the wave is totally absorbed.

Radiation pressure is $I / c$ if the wave is totally reflected.

Radiation pressure is $2 I / c$ if the wave is totally reflected.

Radiation pressure is in the range $I / c < p < 2 I / c$ for real surface.

answer is A, C, D.

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Detailed Solution

When electromagnetic radiation of an intensity 𝐼 is incident on a perfectly reflective surface, the radiation pressure 𝑃 exerted on the surface is given by

$P = \frac{2 I}{c}$ , where, 𝑐 is the speed of light.

When electromagnetic radiation of an intensity 𝐼 is incident on a perfectly absorbing surface, the radiation pressure 𝑃 exerted on the surface is given by

$P = \frac{I}{c}$ , where, 𝑐 is the speed of light.

For other surfaces,

$\frac{I}{c} < p < \frac{2 I}{c}$

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