Question

what is wave number and give its unit​

Answer 1

Explanation:

the wavenumber (also wave number or repetency) is the spatial frequency of a wave, measured in cycles per unit distance or radians per unit distance. 

unit-reciprocal metres (1/m, or m-1) and reciprocal centimetres (1/cm, or cm-1).

Answer 2

Answer:

A unit number of frequency in atomic, molecular, and nuclear spectroscopy equal to the true frequency divided by the speed of light and thus equal to the number of waves in a unit distance . . . this number is called the wave number of the spectrum line.