Homework Help: Physics

Posted by Kurst on Saturday, March 15, 2008 at 10:22pm.

Does one Candela (SI Unit for lumious intesnity) = lumens per metre squared,

i.e. 1 Cd = 1 lum/m^2

if not, what is the relationship between candela and lumens?

Physics - bobpursley, Saturday, March 15, 2008 at 11:32pm
They dont measure the same thing. Lumens measures light output,and candela measures light on a surface.

1 candela= lumen/steradian
- Physics - Kurst, Sunday, March 16, 2008 at 6:04am
  Then, in the light intensity equation E=L/r^2, where E is illumination, L is luminous intensity and r is distance, what are the units of each factor?
Physics - drwls, Sunday, March 16, 2008 at 7:11am
Candela refers to lumens emitted per steradian in a particular direction by a pointlike source. It is related to the old unit "candle". It does not refer to the lumens hitting a surface per area, that is called illuminance, and is measured in lux.

In the equation E = L/r^2, E (illuminance) is in lux, L is in candelas and r is in meters.

Recommended reading:
http://en.wikipedia.org/wiki/Candela

Answer this Question

Related Questions

chemistry - The watt is the derived SI unit of power, the measure of energy per ...
Math {ASAP} - IS THIS RIGHT The length of the bat is probably about 34 in. ...
Physics - A CD rotates at 500 (revolutions per minute) while the last song is ...
Physics - Which of the following statements about SI distance units is not ...
Chemistry (Check) - Completion 1)Metric 2)Five 3)Meter 4) 5)Weight The ...
Physics SI unit - • what is the SI unit for electric force ?
Business - The average light output for a domestic bulb is 80 lumens with a ...
physical - Prove that the SI unit of gravitatinal feild strength,N.kg to the ...
college - RNO Company's market for the Model 55 has changed significantly, ...
Physics - A compact disc spins at 2.8 revolutions per second. An ant is walking ...

For Further Reading

First Name:
School Subject:
Answer: