The Intensity I of Light Varies Inversely as the Square $\frac { 2 } { 9 }$

question 77

Multiple Choice

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 2 foot-candles, find the intensity on a screen 15 ft from the light.

• A) \(\frac { 2 } { 9 }\) foot-candle
• B) \(\frac { 2 } { 10 }\) foot-candle
• C) \(1 \frac { 2 } { 9 }\) foot-candles
• D) 2 foot-candles

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