The electric vector vibration of an electromagnetic wave is given by `E = (50NC^(-1)) sin omega(t-(x)/(c))`, The intensity of the wave is

Options

A. `2.3 Wm^(-2)`
B. `4.3 Wm^(-2)`
C. `3.3 Wm^(-2)`
D. `1.8 Wm^(-2)`

Answer

C

Explanation

The intensity is, `I = 1/1 epsi_(0)E_(0)^(2)c`
`= 1/2 (8.85 xx 10^(-12)N-m^(2)C^(-2))xx (50 NC^(-1))^(2) xx 3 xx 10^(8)ms^(-1)`
`=3.3 wm^(-2)`