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An EM wave of intensity I falls on a surface kept in vacuum an

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

Name: Video solution 1: An EM wave of intensity I falls on a surface kept in vacuum and exerts radiation pressure p on it. Which of the followings are true?
Uploaded: 2022-04-09T10:55:04.000Z
Duration: 1 min
Description: Video solution 1: An EM wave of intensity I falls on a surface kept in vacuum and exerts radiation pressure p on it. Which of the followings are true?

Radiation pressure is

l / c

if the wave is totally absorbed

Radiation pressure is

l / c

if the wave is totally reflected

Radiation pressure is

21/ c

if the wave is totally reflected

Radiation pressure is in the range

I / c < p < 2 I / c

for the real surfaces

Views: 5,671 students

Updated on: Apr 9, 2022

Book:

Master Resource Book in JEE Main Physics (Arihant)

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Eleanor Discussed

An EM wave of intensity

I

falls on a surface kept in vacuum and exerts radiation pressure

p

on it. Which of the followings are true?

8 mins ago

Discuss this question LIVE

8 mins ago

Text solutionVerified

Radiation pressure

(p)

is the force exerted by electromagnetic wave on unit area of the surface, i.e., rate of change of momentum per unit area of the surface. Momentum per time per unit area

= \frac{intensity}{speed of wave} = \frac{I}{C}

Change in momentum per unit time per unit area

= Δ1/ C =

radiation pressure (p), i.e.,

p = Δ l / c

. Momentum of incident wave per unit time per unit area

// C

. When wave is fully absorbed by the surface, the momentum of the reflected wave per unit time per unit area

= 0

. Radiation pressure

(p) =

change in momentum per unit time per unit area

= \frac{Δ l}{c} = \frac{l}{c} - 0 = \frac{l}{c}

When wave is totally reflected, then momentum of the reflected wave per unit time per unit area

= - I / C

. Radiation pressure

(p) = \frac{l}{c} - (- \frac{l}{c}) = \frac{2 l}{c}

Here,

p

lies between I/c.

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Question Text	An EM wave of intensity $I$ falls on a surface kept in vacuum and exerts radiation pressure $p$ on it. Which of the followings are true?
Updated On	Apr 9, 2022
Topic	Electromagnetic Waves
Subject	Physics
Class	Class 12
Answer Type	Text solution:1 Video solution: 1
Upvotes	235
Avg. Video Duration	1 min

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

Text solutionVerified

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