Q3 / 90 · JEE Main 2024 (09 Apr Shift 2) · Chemistry
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 \(\frac{1}{'\mathrm{~B}^{\prime}}\) watt per steradian.
'A' and 'B' are respectively
- Correct answerA540 and 683
- B450 and 683
- C450 and \(\frac{1}{683}\)
- D540 and \(\frac{1}{683}\)
Solution
The candela is the luminous intensity of a source that emits monochromatic radiation of frequency radiation of frequency $540 \times 10^{12} \mathrm{~Hz}$ and has a radiant intensity in that direction of $\frac{1}{683} \mathrm{w} / \mathrm{sr}$. It is unit of Candela.
Hence, the correct answer is option: 'A'.