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A radio station has a power output of 200 watts. What is the intensity in watts/m2 at a distance
of 2 miles from the station? A car has an interior volume of 3.5 m^3 and is at a temperature of 30
degrees C
Solution
2)
Intensity, I = Power/area = P/A
So, for a distance of radius, r = 2 miles,
the total area of spherical space: A = 4*pi*r^2
So, A = 4*pi*(2*1.61*1000)^2 = 1.303*10^8 m2
So, I = 200/(1.303*10^8)
= 1.53*10^-6 W/m2

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