source 3 m point q point p A
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
Related questions
Question
A point source emits 200 radiant watts and has a luminous efficacy of 120 lumens/watt. Its
spatial distribution is spherically uniform. state any assumptions, check answer w bold text.
a) What is the luminous intensity of this source? 1910 cd
b) What is the average illuminance on a unit sphere centered around the point source? 6000/pii lx or fc
c) What is the illuminance at point p at the center of circular surface A? 212 Ix
d) If surface A has a radius of 2 m, what is the illuminance at point q? 122 lx
f) what is the total number of lumens incident onto surface a? ~2015lm
g) The total reflectance of surface A is 0.50. What is the average exitance of surface A? 80 Im/m2
Transcribed Image Text:source
3 m
point q
point p
A
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