A 100-kW radio station emits EM waves in all directions from an antenna on top of a mountain. What is the intensity of the signal at a distance of 10 km?
a. 8 × 10^-5 W/m2
b. 8 × 10^-6 W/m2
c. 3 × 10^-3 W/m2
d. 0.8 W/m2
e. 2.5 × 10^-5 W/m2
A
Physics & Space Science
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