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The intensity of electromagnetic wave at...

The intensity of electromagnetic wave at a distance of `1 Km` from a source of power `12.56 Kw`. Is

A

`10^(-3)` W`m^(-2)`

B

`4 xx 10^(-3)` W`m^(-2)`

C

`12.56 xx 10^(-3)` W `m^(-2)`

D

`1.256 xx 10^(-3)` W `m^(-2)`

Text Solution

Verified by Experts

The correct Answer is:
A
`I = (P)/(4 pi r^(2))`
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NARAYNA-ELECTROMAGNETIC WAVES -EXERCISE -1(C.W)
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  2. An electromagnetic wave of frequency v=3.0 MHz passes from vacuum into...

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  3. In a plane electromagnetic wave propagating in space has an electric f...

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  4. The amplitude of the magnetic field part of a harmonic electromagnetic...

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  5. In a plane electromagnetic wave, the electric field oscillates sinnuso...

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  6. In a plane electromagnetic wave, the electric field oscillates sinusoi...

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

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  8. The amplitude of the sinusodially oscillating electric field of a plan...

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  9. Light with energy flux of 18W//cm^(2) falls on a non reflecting surfac...

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  10. Light with energy flux of 24Wm^(-2) is incident on a well polished dis...

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  11. The magnetic field in a plane electromagnetic wave is given by B= (200...

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  12. The average value of electric energy density in an electromagnetic wav...

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  13. The electric field of a plane electromagnetic wave varies with time of...

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  14. The maximum electric field of a plane electromagnetic wave is 88V//m. ...

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  15. The rms value of electric field of a plane electromagnetic wave is 314...

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  16. The magnetic of pointing vector and electric field vector are respecti...

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  17. The intensity of the sunlight reaching the earth is 1380 W(m^-2). Assu...

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  18. The sun delivers 10^3W//m^2 of electromagnetic flux to the earth's sur...

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  19. If a source of power 4 kW produces 10^(20) photons//second, the radiat...

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  20. The intensity of electromagnetic wave at a distance of 1 Km from a sou...

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