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iam666 t1_j8lr1nb wrote

Reply to comment by Randywithout8as in When measuring the wavelength of EM radiation... what's actually being measured? by Grand-Tension8668

This answer, while not incorrect, doesn’t answer OP’s question. OP basically asked “how do we know light has a wavelength” and your answer says “it has a wavelength”.

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Randywithout8as t1_j8ludfk wrote

You might be right. I interpreted it as "when you measure a photon's wavelength, what is actually being measured?" Typically it is the energy of the photon that is being measured. Then the wavelength is calculated. I may have been too literal.

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