For a light that has an intensity of 60 candles at its source, the intensity in candles, S, of the light at a point d d feet from the source is given by the formula S=60k/d^2 60, where k is a constant. If the intensity of the light is 30 candles at a distance of 2 feet from the source, what is the intensity of the light at a distance of 10 feet from the source?
Choose the correct answer:
A) 3/10 candles	B) 1/2 candles	C) 1 1/3 candles	D) 6/5 candles	E) 3 candles
ANS = 3/10   S= 60k/d^2   At 2 feet   30 = 60k/4 so k = 2   At 10 feet   S = 60 *2/10^2 = 6/5   6/5 candles
<result>D</result>
For a light that has an intensity of 60 candles at its source, the intensity in candles, S, of the light at a point d d feet from the source is given by the formula S=60k/d^2 60, where k is a constant. If the intensity of the light is 30 candles at a distance of 2 feet from the source, what is the intensity of the light at a distance of 10 feet from the source?