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

Question

Infinity Learn · Accepted Answer

$$Sav=12$$ε$$0cE02=P4$$$$π$$$$R2$$ ⇒$$E0=P2$$$$π$$$$R2$$ε$$0C$$ $$=32$$×$$3.14$$×$$100$$×$$8.85$$×$$10$$−$$12$$×$$3$$×$$108$$ $$=$$ $$1.34$$ $$V/m$$

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