What is the SI unit of wave number?

s

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s^{- 1}

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m

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m^{- 1}

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Solution

The correct option is D $m^{- 1}$
Wave number is the reciprocal of wavelength of a wave. It is defined as the number of waves per unit length. Since the unit of wavelength is a metre, the unit of wave number is the inverse of a metre.

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