Quanta & photon

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I was reading a book on light and the terms quanta and photon were used for what seemed like the same thing. Whats the differance?
 

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HallsofIvy
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You know, I hope, that in qantum physics quantities are not infinitely divisible but come in "packets". For example, every possible charge is some integer multiple of the charge of an electron. "quantum" (plural "quanta") is the smallest possible amount of whatever quality you are talking about. A photon is specifically one "quantum" of light.
 

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