SOLUTION: The intensity of light received from a source varies inversely as the square of the distance from the source. If the light intensity is 3 foot-candles at 16 feet, find the light i

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Question 306279: The intensity of light received from a source varies inversely as the square of the distance from the source. If the light intensity is 3 foot-candles at 16 feet, find the light intensity at 11 feet.
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
I=k%2FR%5E2
I1%2AR1%5E2=I2%2AR2%5E2=k
3%2A16%5E2=I2%2A11%5E2
I2=3%2A%28256%2F121%29
I2=6.35
Approximately 6.35 footcandles