A flood light is covered with a fitter that transmits red light. The electric field of the emerging beam is represented by a sinusoidal plane wave
`E_(x) = 36 sin (1.20 xx 10^(7) z – 3.6 xx 10^(15) t) V // m`
 The average intensity of beam in `"watt" // "(metre)"^(2)` will be :

Options

A. 6.88
B. 3.44
C. 1.72
D. 0.86

Answer

C

Explanation

`I_("aver.")=(1)/(2)epsilon_(0)E_(0)^(2) xx C=1.719 W // m^(2)`