By using spherical wave theory, the intensity of radio transmitter is 4.97 x 10‾⁶ W/m².
We need to know about the intensity of spherical waves to solve this problem. The intensity of a spherical wave is proportional to power and inversely proportional to the square of the distance. It can be written as
I = P / 4πr²
where I is the intensity, P is the power and r is the distance from the source.
From the question above, we know that:
r = 8 km
P = 4 kW
Convert to International Unit
r = 8 x 10³ m
P = 4 x 10³ W
By substituting the parameter, we get
I = P / 4πr²
I = 4 x 10³ /( 4π(8 x 10³)² )
I = 4.97 x 10‾⁶ W/m²
Hence, the intensity of radio transmitter is 4.97 x 10‾⁶ W/m².
Find more on spherical wave at: https://brainly.com/question/8168320
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