A lamp emits monochromatic green light uniformly in all directions. The lamp is 3% efficient in converting electrical power to electromagnetic waves and consumes 100W of power. The amplitude of the electric field associated with the electromagnetic radiation at a distance of 10m from the lamp will be

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1.34 V/m

2.68 V/m

5.36 V/m

9.37 V/m

answer is A.

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Detailed Solution

Sav=12ε0cE02=P4πR2 ⇒E0=P2πR2ε0C =32×3.14×100×8.85×10−12×3×108 = 1.34 V/m

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