Multiple choice

The SI unit for luminous intensity is

  1. Candela

  2. Volt

  3. Watt

  4. Candle
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A Correct answer
Explanation

1 The candela is defined to be the luminous intensity of a light source producing single-frequency light at a frequency of 540 terahertz (THz) with a power of 1/683 watt per steradian, or 18.3988 milliwatts over a complete sphere cantered at the light source.

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