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

(a) 1.73 V/m

(b) 2.45 V/m

(c) 5.48 V/m

(d) 7.75 V/m

1 Answer

+3 votes
by (30.7k points)
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Best answer

Correct Option (b) 2.45 V/m

Explanation:

Consider the LED as a point source of light. Let power of the LED is P.

Intensity at r from the source

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