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

$$I=P4$$$$π$$$$r2$$, $$P=3$$% of $$100$$ $$W=3$$ $$WP4$$$$π$$$$r2=12$$∈$$0E02C$$ ; $$Pr2=124$$π∈$$0E02C3100=1219$$ x $$109E02$$ x $$3$$ x $$108E02=1.8$$ ; $$E0=1.8=1.34$$ $$Vm-1$$

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