JEE Main · 2024 · 09 Apr 2024 · Shift 2 · Chapter_pending

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

\times 1 0^{12}

hertz and that has a radiant intensity in that direction of

\frac{1}{^{'} B ^{'}}

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

Answer: (B)

Solution

By definition, the candela is the luminous intensity, in a given direction, of a source emitting monochromatic radiation of frequency

540 \times 1 0^{12}

Hz with a radiant intensity in that direction of

\frac{1}{683}

W/sr.

So

A = 540

and

B = 683

JEE Main · 2024 · 09 Apr 2024 · Shift 2 · Single correct option