GK
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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CANDELA
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SEC
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KG
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METER
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Detailed explanation-1: -The candela (cd) is defined by taking the fixed numerical value of the luminous efficacy of monochromatic radiation of frequency 540 × 1012 Hz, Kcd, to be 683 when expressed in the unit lm W−1, which is equal to cd sr W−1, or cd sr kg−1 m−2 s3, where the kilogram, meter and second are defined in terms of h, c and ∆Cs.
Detailed explanation-2: -The candela, symbol cd, is the SI unit of luminous intensity in a given direction.
Detailed explanation-3: -The candela has replaced the standard candle or lamp as a unit of luminous intensity in calculations involving artificial lighting and is sometimes called the new candle. It is the unit of Luminous intensity. The symbol of Candela is Cd. 1 candela is equal to 4 lumen.