The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 'A' × 1012 hertz and that has a radiant intensity in that direction of 1 'B' wa

Question

The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 'A' × 1012 hertz and that has a radiant intensity in that direction of 1 'B' watt per steradian. 'A' and 'B' are respectively

(A) 540 and 1
(B) 540 and 683
(C) 450 and 1
(D) 450 and 683

Prashant Kotian · Accepted Answer

Correct answer: B. The candela is the luminous intensity of a source that emits monochromatic radiation of frequency radiation of frequency 540 × 1012 Hz and has a radiant intensity in that direction of 1 683 w/sr. It is unit of Candela.

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