Solve
-The Intensity I of Light Varies Inversely as the Square

question 35

Multiple Choice

Solve.
-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 ft from a light is 4 foot candles, find the intensity on a screen 20 ft from the light.
Express the answer as a fraction.

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

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