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B = 60/4pi(r^2) The equation above gives the brightness, B, cast by 60 Watt light bulb on an object r meters away from the light
B = 60/4pi(r^2)
The equation above gives the brightness, B, cast by 60 Watt light bulb on an object r meters away from the light bulb. Brightness is measured in Watts per meter squared.
Two identical objects are held up to the light of the bulb. Object x is illuminated with a brightness 9 times greater than object y. The distance of object x from the light bulb is what fraction of the distance of object y from the light bulb?
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