Question
The unit of luminous flux is
The correct answer is
Lumen
Unit of Luminous Flux Explained
The question asks for the standard unit measuring luminous flux.
Luminous Flux Definition
Luminous flux measures the total quantity of visible light emitted by a source, essentially the perceived power of light.
Correct Unit Identification
The SI unit for luminous flux is the lumen, often denoted by the symbol lm.
Analysis of Options
Let's examine why other options are not the unit for luminous flux:
- Steradian (sr): This is the unit of solid angle, measuring how large an object appears from a certain point.
- Candela (cd): This is the SI base unit for luminous intensity, which measures the light output in a specific direction.
- Lux (lx): This is the SI unit for illuminance, measuring the amount of luminous flux falling on a surface area (1 lx = 1 lm/m2).
Therefore, the correct unit for luminous flux is the lumen.
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