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Homework Help: Wavelength of a laser exciting H atom from n =2 to n = 5

  1. Apr 17, 2010 #1
    1. A monochromatic laser is exciting hydrogen atoms from the n = 2 state to the n = 5 state. What is the wavelength of the laser?

    2. frequency = f = delta E / h
    lambda = c/f

    3. First, is the following approach valid:

    I find delta E by computing E5 - E2, where En = n2h2/8mL2

    I then divide that answer by h to obtain f, then do c/f = lambda.

    If that's a valid approach, then I am confused as to what I use for L in the En formula.
  2. jcsd
  3. Apr 17, 2010 #2
    Nevermind, I got it.
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