Electric field of electromagnetic wave is represented by `E = 50 sin (omega t -(x)/(c ))NC^(-1)`. Intensity of wave is ….. `Wm^(-2)`.

Options

A. (A) 50
B. (B) `1.1xx10^(-8)`
C. (C) `3.3`
D. (D) `5.5xx10^(-19)`

Answer

C

Explanation

Here `E_(m)=50 NC^(-1)`
`therefore E_(rms)=(50)/(sqrt(2))NC^(-1)`
Intensity of wave,
`I=c in_(0)E_(rms)^(2)`
`=(3xx10(8)xx8.85xx10^(-12)xx2500)/(2)=3.3 Wm^(-2)`