Question

what is the difference between wave number and frequency​

Answer 1

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Answer:

Frequency is a measurement of the number of wave cycles per second. Wavenumber is the reciprocal of the wavelength multiplied by a constant. Although they look the same, the difference is that wavenumber has nothing to do with the velocity of the wave- wavenumber is measured in cm^-1, which doesn't include a time unit.

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Answer 2

ANSWER...........

Frequency is a measurement of the number of wave cycles per second. 

 Wave number is the reciprocal of the wave length multiplied by a       constant. 

 Although they look the same, the difference is that wave number has    nothing to do with the velocity of the wave- wave number is measured in  cm^-1, which doesn't include a time unit. This makes it useful for situations  where the velocity or frequency are not fixed. 

It has particular use in spectroscopy and quantum mechanics, where it is often a more convenient measurement than frequency or wavelength.

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