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The wavelength of a sinusoidal wave is the spatial period of the wave—the distance over which the wave's shape repeats, and the inverse of the spatial frequency or wavenumber. Determined by considering the distance between consecutive corresponding points of the same phase, such as crests. Use for wavenumber, wavelength, frequency.

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What exactly is meant by the wavelength of a photon?

What keeps me up at night is the question "How can a photon have a wavelength of a few kilometres and yet still be thought of as a particle?" … In other words, is the wavelength of a photon simply the uncertainty in its position? …