# Physical significance of wavenumber

1. Aug 5, 2010

### pallavi12

i do not understand what is the physical significance of wavenumber.
i have a plot with wavenumber on x axis and count on the y axis.

2. Aug 5, 2010

### Petr Mugver

Re: wavenumber

Wavenumber is related to wavelength by

$$k=\frac{2\pi}{\lambda}$$

Maybe you are counting the number of photons of a certain wavelength that reach a detector?