A light bulb radiates 190 nW of single-frequency sinusoidal electromagnetic waves uniformly in all directions. Calculate...
A light bulb radiates 190 nW of single-frequency sinusoidal electromagnetic waves uniformly in all directions. Calculate the average intensity of the light from this bulb at a distance of 45 mm.
Homework Answers
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intensity at a distance r is given by
P is the power
P =190 x10-9 W
r= 45 x10-3 m
=> I = 7.4665 x10-6 W/m2
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