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  • A Flashlight is covered with a filter that transmits red light. The electric field of the emerging beam is represented by a

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A Flashlight is covered with a filter that transmits red light. The electric field of the emerging beam is represented by a sinusodial plane wave E_{x}=36sin(1.20\times ^{7}z-3.6\times 10^{15}t)\frac{v}{m}

The average intensity of beam will be

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@santhosh

 E=E_{o}sinw(t-\frac{x}{c})

and E_{x}=36sin(1.20\times ^{7}z-3.6\times 10^{15}t)\frac{v}{m}

E_{o}=36

So I_{av}=\frac{c\epsilon _{o}E^{2}}{2}=\frac{3\times 10^{8}\times 8.85\times 10^{-12}\times 36^{2}}{2}

I_{avg}=1.72\, w/m^{2}

  

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avinash.dongre

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