Solve the Variation Problem $\frac { 3 } { 16 }$

question 134

Multiple Choice

Solve the variation problem.
-The intensity I of light varies inversely as the square of the distance D from the source. If the intensity of illumination on a screen 5 feet from a light is 3 foot candles, find the intensity on a screen 20 ft from the light.

• A) \(\frac { 3 } { 16 }\) foot-candles
• B) \(\frac { 3 } { 17 }\) foot-candles
• C) 2 foot-candles
• D) \(1 \frac { 3 } { 16 }\) foot-candles

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