by Guest » Fri Oct 05, 2007 6:11 pm
In what context? The only context I can think of that makes any sense is the energy of a photon.
Inverse centimeters are sometimes used as a "wave number" the number of cycles of any electromagnetic wave in a centimeter (mostly used for infrared and light). It is a quasifrequency, as a real frequency would be the number of waves in one second or about 3 x 10^8 m. Hence real frequency is 3 x 10^10 greater than this wave number.
The energy of a photon is given by E = h*nu or h*c*/lamda where nu is frequency and lambda is wavelength. h is Planck's constant, Google for value