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JEE Main 2015 Physics question

PhysicsElectromagnetic WavesJEE Main 2015

A red LED emits light at 0.1 watt uniformly around it. The amplitude of the electric field of the light at a distance of 1 m from the diode is:

Answer: (3)

Solution

At 1 m the intensity is W/m². Using :

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Question ID VK-115157