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The energy and momentum of an electron are related to the frequency and wavelength of the associated matter wave by the relations: .
But while the value of is physically significant, the value of (and therefore, the value of the phase speed ) has no physical significance. Why?

Vinay

Within the addictive constant, the absolute value of a particle’s energy is arbitrary. As a result, the wavelength is relevant, but the electron’s frequency (v) has no direct physical importance. As a result, product v has no physical meaning.