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Light with an energy flux of 18 {~W} / {cm}^{2} falls on a non

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Light with an energy flux of $18 W / cm^{2}$ falls on a non-reflecting surface at normal incidence. If the surface has an area of $20 cm^{2}$ , then the average force exerted on the surface during a 30 minute time span is

Name: Video solution 1: Light with an energy flux of 18 W/cm2 falls on a non-reflecting surface at normal incidence. If the surface has an area of 20 cm2, then the average force exerted on the surface during a 30 minute time span is
Uploaded: 2023-04-29T03:14:08.000Z
Duration: 11 min
Description: Video solution 1: Light with an energy flux of 18 W/cm2 falls on a non-reflecting surface at normal incidence. If the surface has an area of 20 cm2, then the average force exerted on the surface during a 30 minute time span is

1.2 \times 1 0^{- 6} N

2.16 \times 1 0^{- 3} N

2.16 \times 1 0^{- 6} N

1.2 \times 1 0^{- 3} N

Views: 5,269 students

Updated on: Apr 29, 2023

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Master Resource Book in JEE Main Physics (Arihant)

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Mila Discussed

Light with an energy flux of

18 W / cm^{2}

falls on a non-reflecting surface at normal incidence. If the surface has an area of

20 cm^{2}

, then the average force exerted on the surface during a 30 minute time span is

5 mins ago

Discuss this question LIVE

5 mins ago

Text solutionVerified

(a) The total energy falling on the surface is

U = (18 W / cm^{2}) \times (20 cm^{2}) \times (30 \times 60) U = 6.48 \times 1 0^{5} J

Therefore, the total momentum delivered (for complete absorption) is

p = \frac{U}{C} = \frac{6.48 \times 1 0 ^{5}}{3 \times 1 0 ^{8}} = 2.16 \times 1 0^{- 3} kg - m / s

The average force exerted on the surface is

F = \frac{p}{t} = \frac{2.16 \times 1 0 ^{- 3}}{0.18 \times 1 0 ^{4}} = 1.2 \times 1 0^{- 6} N

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Question Text	Light with an energy flux of $18 W / cm^{2}$ falls on a non-reflecting surface at normal incidence. If the surface has an area of $20 cm^{2}$ , then the average force exerted on the surface during a 30 minute time span is
Updated On	Apr 29, 2023
Topic	Electromagnetic Waves
Subject	Physics
Class	Class 12
Answer Type	Text solution:1 Video solution: 2
Upvotes	334
Avg. Video Duration	10 min

Light with an energy flux of $18 W / cm^{2}$ falls on a non-reflecting surface at normal incidence. If the surface has an area of $20 cm^{2}$ , then the average force exerted on the surface during a 30 minute time span is

Text solutionVerified

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Light with an energy flux of 18 W/cm2 falls on a non-reflecting surface at normal incidence. If the surface has an area of 20 cm2, then the average force exerted on the surface during a 30 minute time span is

Text solutionVerified

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Light with an energy flux of $18 W / cm^{2}$ falls on a non-reflecting surface at normal incidence. If the surface has an area of $20 cm^{2}$ , then the average force exerted on the surface during a 30 minute time span is