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How we can find wavelength from different waves?

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Regardless of the nature of the wave in question, a wave's wavelength can always be found by dividing 1 by the wave's frequency, if known.

Otherwise, for a light wave, a spectrometer can tell the wavelength, whether is is withing the visible light spectrum or not. For a sound wave, a microphone attatched to an osciloscope may be used to determine a wavelenght.

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