1. How many lumens pass through an area of 0.2 m? on a sphere of radius 5 m, if an 900 cm isotropic source at its center? a. 7.2 Im b. 180 im c. 36 lm d. 3.75 lm 2. A 60-Watt, 110 Volts lamp is rated 11.0 Im/watt. At what distance from the lamp is the maximum illumination 5 flux? a. 3.24 m b. 7.00 m c. 11.5 m d. 1.91 m 3. Compute the illumination at the edge of a circular table of radius of 1 m, if a 250 cd source is suspended 4 m above its center. a. 6.34 lux b. 3.56 lux c. 14.3 lux d. 15.2 lux
1. How many lumens pass through an area of 0.2 m? on a sphere of radius 5 m, if an 900 cm isotropic source at its center? a. 7.2 Im b. 180 im c. 36 lm d. 3.75 lm 2. A 60-Watt, 110 Volts lamp is rated 11.0 Im/watt. At what distance from the lamp is the maximum illumination 5 flux? a. 3.24 m b. 7.00 m c. 11.5 m d. 1.91 m 3. Compute the illumination at the edge of a circular table of radius of 1 m, if a 250 cd source is suspended 4 m above its center. a. 6.34 lux b. 3.56 lux c. 14.3 lux d. 15.2 lux
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Transcribed Image Text:1. How many lumens pass through an area of 0.2 m? on a
sphere of radius 5 m, if an 900 cm isotropic source at its
center?
a. 7.2 Im
b. 180 im
c. 36 lm
d. 3.75 lm
2. A 60-Watt, 110 Volts lamp is rated 11.0 Im/watt. At what
distance from the lamp is the maximum illumination 5 flux?
a. 3.24 m
b. 7.00 m
c. 11.5 m
d. 1.91 m
3. Compute the illumination at the edge of a circular table of
radius of 1 m, if a 250 cd source is suspended 4 m above
its center.
a. 6.34 lux
b. 3.56 lux
c. 14.3 lux
d. 15.2 lux
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