Answer:
The intensity of the EM wave is 5.729 W/m²
The rms value of the electric field is 46.452 V/m
Explanation:
Given;
power of the electromagnetic wave, P = 1800 W
The intensity of light is given by;
I = P / A
Where;
A is the surface area of the sphere = 4πr²
A is the surface area of the sphere = 4π(5)²
A is the surface area of the sphere = 314.2 m²
The intensity is calculated as;
I = P / A
I = (1800) / (314.2)
I = 5.729 W/m²
The rms value of the electric field is given by;
[tex]E_{rms} = \sqrt{\frac{I}{c \epsilon _o}}\\\\E_{rms} = \sqrt{\frac{5.729}{(3*10^8)( 8.85*10^{-12})}}\\\\E_{rms} = 46.452 \ V/m[/tex]
