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A flood light will be covered with filte...

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 wave
`E_x=38.8sin(1.2xx10^7z-3.6xx10^(15)t)V//m`.
The average intensity of beam in` "watt"//m^2` will be:

Text Solution

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The correct Answer is:
2
Average intensity, `I_(av) = (1)/(2)epsilon_(0) E_(0)^(2) xx c `
`= (( 8 . 85 xx 10 ^(-12)) xx (38 . 8)^(2) xx ( 3 xx 10^(8)))/(2) ~~ 2 W // m^(2)`
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