Physics Practice Problems Energy Carried by Electromagnetic Waves Practice Problems Solution: A sinusoidal electromagnetic wave has intensity I ...

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Solution: A sinusoidal electromagnetic wave has intensity I = 100 W/m 2 and an electric field amplitude E. What is the electric field amplitude of a 50 W/m 2 electromagnetic wave with the same wavelength?(a) 4E(b) 2E(c) 2√2E(d) √2E(e) E / (2√2) (f) E / √2(g) E / 4(h) E / 2

Problem

A sinusoidal electromagnetic wave has intensity I = 100 W/m 2 and an electric field amplitude E. What is the electric field amplitude of a 50 W/m 2 electromagnetic wave with the same wavelength?

(a) 4E

(b) 2E

(c) 2√2E

(d) √2E

(e) E / (2√2) 

(f) E / √2

(g) E / 4

(h) E / 2