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Homework Help: Finding ratio of wavelengths

  1. May 4, 2015 #1
    1. The problem statement, all variables and given/known data

    If λCu is the wavelength of Kα X-ray line of copper (atomic number 29) and λMo is the wavelength of the KαX-Ray line of molybdenum (atomic number 42), then the ratio λCuMo is close to
    2. Relevant equations
    De broglie relation λ = h/p

    3. The attempt at a solution
    How to calculate momentum?
    Or is there some other formula?
  2. jcsd
  3. May 4, 2015 #2


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    There is some other formula. I google "k-alpha x-ray energy"and wikipedia tells me the answer straight away. You can do that too !
  4. May 4, 2015 #3
    Oh, so that is Moseley's formula. Never seen that.
    It was formula oriented , okay.
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