Question

A flood light is covered with a fitter than transmits red light. The electric field of the emerging beam is represented a sinusolidal plane wave
`E_(x)=36 sin (1.20xx10^(7)z-3.6xx10^(15)t) V//m`
The average intensity of beam is `"watt"//("metre")^(2)` will be
A. `6.88`
B. `3.44`
C. `1.72`
D. `0.86`

Answer 1

Correct Answer - c
`I_("ever")=(1)/(2)epsilon_(0)E_(0)xxC= 1.719 W//m^(2)`