Structure of Atom

Question

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.
'…' and '…' are respectively

Accepted Answer

Option C. The definition of the candela involves a source emitting monochromatic radiation of a specific frequency and having a precise radiant intensity in a given direction. The candela is thereby defined based on both the frequency of the monochromatic light and its radiant intensity in watts per steradian. According to the given statement, we are dealing with a frequency identified as '…' … hertz and a radiant intensity specified as … watt per steradian. However, there seems to be a small confusion in how the values are represented in the question. The correct interpretation and formulation based on the International System of Units (SI) are as follows:

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Structure of Atom

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