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The wave number $\bar{\nu}$ of electromagnetic radiation is defined as
A$\bar{\nu} = c\lambda$
B$\bar{\nu} = \lambda/c$
C$\bar{\nu} = 1/\lambda$
D$\bar{\nu} = \lambda$
Answer & Solution
Correct answer: C. $\bar{\nu} = 1/\lambda$
Wave number is the number of waves per unit length, i.e. the reciprocal of wavelength: $\bar{\nu} = 1/\lambda$ in $m^{-1}$ (or $cm^{-1}$ in spectroscopy).
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