Medium
The candela is the luminous intensity,in a given direction,of a source that emits monochromatic radiation of frequency '$A$' $\times 10^{12}$ hertz and that has a radiant intensity in that direction of $\frac{1}{B}$ watt per steradian. '$A$' and '$B$' are respectively
- A$540$ and $\frac{1}{683}$
- B$540$ and $683$
- C$450$ and $\frac{1}{683}$
- D$450$ and $683$
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