The wave number $\bar{
u}$ of electromagnetic radiation is defined as

Question

Accepted Answer

C. $\bar{
u} = 1/\lambda$

Wave number is the number of waves per unit length, i.e. the reciprocal of wavelength: $\bar{
u} = 1/\lambda$ in $m^{-1}$ (or $cm^{-1}$ in spectroscopy).

Answer

$\bar{
u} = c\lambda$

Answer

$\bar{
u} = \lambda/c$

Answer

$\bar{
u} = \lambda$

The wave number $\bar{\nu}$ of electromagnetic radiation is defined as

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