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A flood light is covered with a fitter that transmits red light. The electric field of the emerging beam is represented by a sinusoidal plane wave $E_{v} = 36 \sin (1.20 \times 10^{7} z - 3.6 \times 10^{15} t) V / m$ . The average intensity of beam in W/m² will be

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6.88

3.44

1.72

0.86

answer is C.

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Detailed Solution

$I_{a v} = \frac{1}{2} ε_{0} E_{0}^{2} \times c = 1.719 W / m^{2} (∵ E_{0} = 36 V / m)$

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