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A flood light will be covered with filter that transmits red light. The electric field of the emerging beam is represented by a sinusoidal plane waveEX=38.8sin1.2×107z−3.6×1015tvm The average intensity of beam in wattm2 will be

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Detailed Solution

Average intension  Iave=12∈o Eo2CThe given equation is EX=38.8sin1.2×107z−3.6×1015tvm Is compared with general equationEx=Eosinkz−wt thenEo=38.8 V/m Hence, Iave=12×8.85×10−12×38.82×3×108Iave=2 W/m2
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A flood light will be covered with filter that transmits red light. The electric field of the emerging beam is represented by a sinusoidal plane waveEX=38.8sin1.2×107z−3.6×1015tvm The average intensity of beam in wattm2 will be