1.

Component of electric field of electromagnetic wave is as following :E_(x)=10^(2)sin(pi(9xx10^(14)t-3xx10^(6)z)),E_(y)=0, E_(z)=0, then intensity of wave is ….

Answer»

`13.3 Wm^(-2)`
`0.133 Wm^(-2)`
`1.33 Wm^(-2)`
`13.3xx10^(-12)Wm^(-2)`

Solution :Intensity of wave,
`I=c in_(0)E_(rms)^(2)`
`=3xx10^(8)xx8.85xx10^(-12)xx(100)/(2) "" [because E_(rms)=(E_(m))/(SQRT(2))]`
`therefore I=13.3Wm^(-2)`


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