The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency hertz and that has a radiant intensity in that direction of watt per steradian.

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Solution

Q.
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. [2024]

1 450 and 683

2 540 and $\frac{1}{683}$

3 540 and 683

4 450 and $\frac{1}{683}$

Ans.
(3)

The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency $540 \times 10^{12}$ Hz and that has a radiant intensity in that direction of $\frac{1}{683}$ watt per steradian.

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