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a) A 500-watt Tungsten Halogen lamp has an efficacy of 20 lumens/watt. Calculate its mean spherical intensity. b) Two sources of candle power or luminous intensity 200 candela (cp) and 250 candela (cp) are mounted at 8 and 10 m, respectively? The horizontal distance between the lamp posts is 40 m, calculate the illumination in the middle of the posts.

a) A 500-watt Tungsten Halogen lamp has an efficacy of 20 lumens/watt. Calculate its mean spherical intensity. b) Two sources of candle power or luminous intensity 200 candela (cp) and 250 candela (cp) are mounted at 8 and 10 m, respectively? The horizontal distance between the lamp posts is 40 m, calculate the illumination in the middle of the posts.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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a) A 500-watt Tungsten Halogen lamp has an efficacy of 20 lumens/watt. Calculate its mean spherical intensity. b) Two sources of candle power or luminous intensity 200 candela (cp) and 250 candela (cp) are mounted at 8 and 10 m, respectively? The horizontal distance between the lamp posts is 40 m, calculate the illumination in the middle of the posts.
1₁=200 cp S₁9 h₁=8m 0, 9, P DY - 250 ap 50 11 120m-20m-1 -40 m- = 10m
Transcribed Image Text:1₁=200 cp S₁9 h₁=8m 0, 9, P DY - 250 ap 50 11 120m-20m-1 -40 m- = 10m
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