Crossword Genius

Quantum of light (6)

Ross

I believe the answer is:

photon

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">quantum of light</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for photon that I've seen before include "Tiny bit of light" , "A little light" , "Quantum particle of light" , "Quantum of electromagnetic radiation" .)

I've seen this clue in the Sydney Morning Herald and The Times.
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