A flood light is covered with a filter that transmits red light. The electric field of the emerg...
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0A flood light is covered with a filter that transmits red light. The electric field of the emerging beam is represented by a sinusoidal plane wave
\[
E_{x}=36 \sin \left(1.20 \times 10^{7} \mathrm{z}-3.6 \times 10^{15} \mathrm{t}\right) \mathrm{V} / \mathrm{m}
\]
The average intensity of the light will be
(a) \( 0.86 \mathrm{~V} / \mathrm{m}^{2} \)
(b) \( 1.72 \mathrm{~W} / \mathrm{m}^{2} \)
(c) \( 3.44 \mathrm{~W} / \mathrm{m}^{2} \)
(d) \( 6.88 \mathrm{~W} / \mathrm{m}^{2} \)
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