Solve the Problem $5 \mathrm { ft }$ From a Light Is 4 Foot Candles, Find the Intensity

question 326

Multiple Choice

Solve the 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 $5 \mathrm { ft }$ from a light is 4 foot candles, find the intensity on a screen 20 ft from the light.

• A) \(\frac { 1 } { 5 }\) foot-candle
• B) \(1 \frac { 1 } { 4 }\) foot-candles
• C) \(\frac { 1 } { 4 }\) foot-candle
• D) 2 foot-candles

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