Question

what is light ?define with unit​

Answer 1

Answer:

a unit adopted in 1979 as the international standard of luminous intensity, defined as the luminous intensity of a source that emits monochromatic radiation of frequency 540 x 1012 hertz and that has a radiant intensity of 1/683 watt/steradian.

Explanation:

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Answer 2

Answer:

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light unit - a measure of the visible electromagnetic radiation. electromagnetic unit, emu - any of various systems of units for measuring electricity and magnetism. illumination unit - a measure of illumination. luminance unit - a measure of luminance.