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Potential diffrenece required to accelerate electron from rest to acquire certain wavelength

  1. Oct 6, 2014 #1
    1. The problem statement, all variables and given/known data
    Calculate the potential difference required to accelerate electron from rest to acquire wavelength of 0.154nm

    2. Relevant equations

    3. The attempt at a solution
    eV = hc / λ
    (1.6x10^-9) (V) = (6.63x10^-34)(3x10^8)/ 0.154x10^-9
    V = 8072V ....
    here's the sample ans :


    Attached Files:

  2. jcsd
  3. Oct 6, 2014 #2
    It's about an electron. There is no speed of light in the formula for momentum of the electron.
    You are mixing up things.

    I think there is a typo in the book. The denominator in the last formula should be ## \lambda ## and not mv.
  4. Oct 6, 2014 #3


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    Gold Member

    It is a typo, but they still used lambda where you would expect them to plug in (incorrectly) v.
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