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A light bulb radiates isotropically (the same in all directions). At a distance r from the
bulb, the intensity of the light is 0.096 W/m2. If the total power radiated by the bulb
is 3.5 W, what is r?
2.3 m
0.99 m
1.7 m
6.9 m
3.5 m
G

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