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Homework Help: Determining Bond Length with Wavelengths

  1. Dec 2, 2012 #1
    1. The problem statement, all variables and given/known data

    Calculate the bond length for the NaCl molecule given that three successive wavelengths for rotational transitions are 23.1 mm, 11.6, mm and 7.71 mm.


    2. Relevant equations

    I = h*wavelength/4pi*speed of light.

    3. The attempt at a solution

    I don't understand how to incorporate the wavelengths.
    But the thing is, I have three wavelengths, not one. Should I take the difference between the three?
     
  2. jcsd
  3. Dec 2, 2012 #2

    ehild

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