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 $$10$$ m 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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