A lamp emits monochromatic green light uniformly in all directions. The lamp is 3% efficient in converting electrical power to electromagnetic waves and consumes 100W of power. The amplitude of the electric field associated with the electromagnetic radiation at a distance of 10m from the lamp will be (a) 1.34 V/m (b) 2.68 V/m (c) 5.36 V/m (d) 9.37 V/m
Added by Shirlin S.
Step 1
Step 1: Calculate the value of the intensity of the lamp's radiation using the formula \( I = \frac{P}{4\pi r^2} \), where \( P = 100 \, W \) and \( r = 10 \, m \). Show more…
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A lamp emits monochromatic green light uniformly in all directions. The lamp is $3 \%$ efficient in converting electrical power to electromagnetic waves and consumes $100 \mathrm{~W}$ of power. The amplitude of the electric field associated with the electromagnetic radiation at a distance of $10 \mathrm{~m}$ from the lamp will be (A) $1.34 \mathrm{~V} / \mathrm{m}$ (B) $2.68 \mathrm{~V} / \mathrm{m}$ (C) $5.36 \mathrm{~V} / \mathrm{m}$ (D) $9.37 \mathrm{~V} / \mathrm{m}$
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Electromagnetic Waves
Round 2
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 $1 \mathrm{~m}$ from the diode is [2015] (A) $2.45 \mathrm{~V} / \mathrm{m}$ (B) $5.48 \mathrm{~V} / \mathrm{m}$ (C) $7.75 \mathrm{~V} / \mathrm{m}$ (D) $1.73 \mathrm{~V} / \mathrm{m}$
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