JEE Main 2014 Physics 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 100 W of power. The amplitude of the electric field associated with the electromagnetic radiation at a distance of 5 m from the lamp will be nearly:
Answer: (2)
Solution
The radiated power is W, so at 5 m the intensity is W/m². Using $I =
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