First slide

Electromagnetic waves and its nature

Question

Light with an energy flux of $25 \times 10^{4} W / m^{2}$ falls on a perfectly reflecting surface area is $15 c m^{2}$ , the average force exerted on the surface is

Moderate

A

$1.25 \times 10^{- 6} N$
B

$2.50 \times 10^{- 6} N$
C

$1.20 \times 10^{- 6} N$
D

$3.0 \times 10^{- 6} N$

Solution

Average force= Average radiation pressure X area
$F o r c e = \frac{2 I}{C} \times A = \frac{2 \times 25 \times 10^{4} \times 15 \times 10^{- 4}}{3 \times 10^{8}} = 2.5 \times 10^{- 6} N$

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App