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Homework Help: Wave number range

  1. Feb 17, 2008 #1
    1. The problem statement, all variables and given/known data
    A 1ns pulse of electromagnetic waves would be 30cm long.
    a) Consider such a pulse of 633 nm wavelength laser light. Find its central wavenumber and the range of wave numbers it is comprised of.
    b) Repeat a except for a 1ns pulse of 100MHz radio

    2. Relevant equations
    [tex] k=\frac{2\pi}{\lambda}[/tex]

    3. The attempt at a solution
    I got the central wavenumber with the above equation. But I am at a lost on where to go from there.
  2. jcsd
  3. Feb 17, 2008 #2
    Do I have to deal with the gaussian wave packet & fouier transform?
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