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A plane electromagnetic wave is incident...

A plane electromagnetic wave is incident on a plane surface of area A, normally and is perfectly reflected. If energy E strikes the surface in time t then average pressure exerted on the surface is (c = speed of light)

A

zero

B

E/Atc

C

2E/Atc

D

E/c

Text Solution

Verified by Experts

The correct Answer is:
A
Energy density (EM waves)
`=epsilon_(0)E_("rms")^(2)=epsilon_(0)((E_(0))/(sqrt2))^(2)=(1)/(2)epsilon_(0)E_(0)^(2)`
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DISHA PUBLICATION-ELECTROMAGNETIC WAVES-Exercise - 1 : Concept Builder (Topicwise)(Topic 1 : Electromagnetic Waves and Displacement Current)
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  2. In an electromagnetic wave the average energy density is associated wi...

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  3. A plane electromagnetic wave is incident on a plane surface of area A,...

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  4. The speed of electromagnetic wave in vacuum

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  5. Electrimagnetic waves are transverse is nature is evident by

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  6. Which of the following shows green house effect?

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  7. The magnetic field In a travelling electromagnetic wave has a peak val...

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  8. Maxwell's modified form of Ampere's circuital law is

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  9. The speed of electromagnetic wave in vacuum

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  10. Which of the following type of radiations are radiated by an oscillati...

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  11. According to Maxwell's hypothesis, a changing electrio field gives ris...

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  12. In an electromagnetic wave

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  13. A beam has intensity 2.5xx10^(14)Wm^(-2). The ratio of electric and ma...

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  14. Conduction current flows

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  15. The displacement current is

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  16. If a source is transmitting electromagnetic wave of frequency 5.2xx10^...

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  17. In an apparatus the electric field was found to oscillate with an ampl...

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  18. In an electromagnetic wave, the electric and magnetising fields are 10...

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  19. A plane electromagnetic wave travels in free space along x-axis. At a ...

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  20. A new system of unit is evolved in which the values of mu(0) and in(0)...

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