Question
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
Answer: Option A
:
A
Sav=12ϵ0cE20=P4πR2
⇒E0=√P2πR2ϵ0C
=√32×3.14×100×8.85×10−12×3×108
=1.34 V/m
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:
A
Sav=12ϵ0cE20=P4πR2
⇒E0=√P2πR2ϵ0C
=√32×3.14×100×8.85×10−12×3×108
=1.34 V/m
Was this answer helpful ?
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