- #1
Mastagamer
- 1
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This is the question
Find the intensity of a light source that produces an illumination of 7.50 lux at a distance of 30m from the source.
This what I get but it's wrong
84823
This is the formula
E = Illumination
I = luminous intensity of the source ( in lumens)
r= distance between the source and the illuminated surface.
1 lux = 1lm/m^2
Formula E = I/(4*pi*(r^2)
So I did I = E*(4*pi*(r^2)
I =?
E=7.50
r = 30m
I = 7.50lux*(4*pi*(30m^2)
and got I = 84823
rounded in many different forms and I still get a wrong answer.. Any help would be appreciate it.
and is wrong because the computer practice test tells me but doesn't give me an answer.
Find the intensity of a light source that produces an illumination of 7.50 lux at a distance of 30m from the source.
This what I get but it's wrong
84823
This is the formula
E = Illumination
I = luminous intensity of the source ( in lumens)
r= distance between the source and the illuminated surface.
1 lux = 1lm/m^2
Formula E = I/(4*pi*(r^2)
So I did I = E*(4*pi*(r^2)
I =?
E=7.50
r = 30m
I = 7.50lux*(4*pi*(30m^2)
and got I = 84823
rounded in many different forms and I still get a wrong answer.. Any help would be appreciate it.
and is wrong because the computer practice test tells me but doesn't give me an answer.
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