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A lamp emits monochromatic green light u...

A lamp emits monochromatic green light uniformly in all directions. The lamp is `3%` efficient in converting electrical power to electromagnetic waves and consumes `100 W` of power. The amplitude of the electric field associated with the electromagnetic radiation at a distance of `5` m from the lamp will be:

A

` 1.34 `V/m

B

`2.68 `V/m

C

`4.02` V/m

D

`5.36` V/m

Text Solution

Verified by Experts

The correct Answer is:
B
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MOTION-ELECTRO MAGNETIC WAVES -EXERCISE - 2
  1. Which of the following statements about electromagnetic waves is/are c...

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  2. A parallel plate capacitor consists of two circular plates each of rad...

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  3. A lamp emits monochromatic green light uniformly in all directions. Th...

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  4. A parallel plate capacitor consists of two circular plates each of rad...

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  5. The transmitting antenna of a radio-station is mounted verticlly. At a...

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  6. In an electromagnetic wave, the direction of the magnetic field induct...

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  7. In an electromagnetic wave

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  8. The magnetic field in a plane EM wave is given by B = (100 mu T) sin...

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  9. For any E.M. wave if E = 100 V/m and B = 3.33 x10^(–7) T. Then the rat...

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  10. A variable frequency AC source is connected to a capacitor. Then on in...

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  11. source of an electromagnetic wave is

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  12. The dimension of E/H is that of

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  13. Poynting vector vec P for an EM wave is

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  14. Which one statement is incorrect about electromagnetic wave

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  15. In an electromagnetic wave, the amplitude of electric field is 10 V/m....

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  16. To establish an instantaneous displacement current of 2A in the space ...

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  17. Which of the following have zero average value in a plane electromagne...

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  18. Which one statement is incorrect

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  19. A plane electromagnetic wave of frequency 25 Mhz travels in free space...

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  20. Displacement current is

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