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Frequence and wavenumbers

  1. Jun 16, 2006 #1
    if frequency is (1/sec), then why is wavenumber (1/cm) considered a unit of frequency?
  2. jcsd
  3. Jun 16, 2006 #2


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    It is considered the spatial representation of frequency, it in itself is not a fequency. However, you can obtain the the wavenumber by dividing the frequency by the speed of light. Observe,

    [tex]c = f\lambda \Leftrightarrow \frac{1}{\lambda} = \frac{f}{c}[/tex]

    [tex]\frac{1}{\lambda}\propto f[/tex]
  4. Jun 19, 2006 #3
    wow! never thought of it that way before~ thank you!!!
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