General Science • PhysicsEasy
What is the SI unit of luminous intensity, which is one of the seven base quantities in the International System of Units?
A. Lumen
B. Candela✓ Correct Answer
C. Lux
D. Watt
💡 Solution & Explanation
The SI base unit of luminous intensity is the candela, which measures the luminous power emitted by a light source in a particular direction. Lumen measures luminous flux, while lux measures illuminance per unit area, and watt measures total radiant power. Luminous intensity specifically accounts for the varying sensitivity of the human eye using standardized spectral weighting functions.
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