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Write the SI unit of luminous intensity ...

Write the SI unit of luminous intensity and the amount of substance.

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The SI unit of luminous intensity is candela (cd). It is defined as the luminous intensity , in a given direction of a source that emits monochromatic radiation of frequency `540xx10^(12)` Hz and has a radiant intensity in that direction of `1"/"683` watt per steradian.
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