EXPLANATION
Question: The SI unit of luminous intensity is:
- a) Lux
- b) Watt
- c) Hertz
- d) Candela
ANSWER: d) Candela
EXPLANATION:
The SI unit of luminous intensity is candela. So the answer is (d).
Luminous intensity is the power emitted by a light source in a particular direction per unit solid angle. It is measured in candela, which is abbreviated as cd.
Lux is the SI unit of illuminance, which is the amount of light falling on a surface. Watt is the SI unit of power, which is the rate at which energy is transferred. Hertz is the SI unit of frequency, which is the number of cycles per second of a wave.
