JEE CHEMISTRY MCQ: STRUCTURE OF ATOM

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The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency '

\mathrm{A}

\times 10^{12}

hertz and that has a radiant intensity in that direction of

\frac{1}{{ }^{\prime} \mathrm{B}^{\prime}}

watt per steradian. 'A' and 'B' are respectively

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Correct option: B

540 and 683

Option B (540 and 683) is correct because the candela is defined with a frequency of 540 × 10¹² Hz and a radiant intensity of 1/683 watt per steradian.

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