First slide

Intensity of electromagnetic wave

Question

Electric field of electromagnetic wave is given by $E = 50 \sin (t - \frac{x}{c}) N / C .$ Then intensity of waves is

Moderate

A

$6 .5 w / m^{2}$
B

$1 .2 w / m^{2}$
C

$3 .3 w / m^{2}$
D

$2 .2 w / m^{2}$

Solution

$I = (energy density) \times C = \frac{1}{2} ε_{0} E_{m}^{2} \times C = \frac{1}{2} \times 8 .85 \times 10^{- 12} {(50)}^{2} \times 3 \times 10^{8} w / m^{2} = 3 .3 W / m^{2}$

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