Question
SI unit of luminous intensity is _____.
This question was previously asked in
RRB NTPC 2024 Undergraduate CBT 1 Question Paper (29-Aug-2025) (Shift 1)
The correct answer is
candela
The correct answer is candela.
The SI unit of luminous intensity is the candela (cd). Luminous intensity is a measure of the amount of visible light emitted by a light source in a particular direction. It's different from other measures like radiant intensity (measured in watts per steradian) because it accounts for the sensitivity of the human eye to different wavelengths of light.
Let's examine the incorrect options:
- Metre (m): The SI unit of length.
- Watt (W): The SI unit of power.
- Mole (mol): The SI unit of amount of substance.
Therefore, only candela correctly represents the SI unit for luminous intensity.
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