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K and L X-rays

  1. Mar 26, 2014 #1

    utkarshakash

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    1. The problem statement, all variables and given/known data

    For a silver atom, energy corresponding to Kα transition is 21.75 KeV. Also minimum energy of a striking electron so as to produce L X-Rays is 3.56 keV. Now, if electron with an energy of 23 keV strike a silver target the characteristic X-rays spectrum will have
    a)only kα and L x-rays
    b)only L x-rays
    c)K and L X-rays
    d) only kα x-rays

    3. The attempt at a solution

    I summed up the two energies and found that it is greater than 23keV. So both can't happen simultaneously. But which X-ray will happen?
     
  2. jcsd
  3. Mar 29, 2014 #2

    UltrafastPED

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    Either one ... so if you obtain a spectrum for a series of trials you will see both.

    You will also see bremsstrahlung (or braking) radiation; this usually makes up the majority of the events.
     
  4. Mar 29, 2014 #3

    utkarshakash

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    But which one?
     
  5. Mar 29, 2014 #4

    TSny

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    In order to produce a K X-ray, you first need to kick an electron out of the K shell. How much energy is required to do that?
     
  6. Mar 29, 2014 #5

    utkarshakash

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    The energy of the 1st shell.
     
  7. Mar 29, 2014 #6

    TSny

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    You should be able to deduce a numerical value for the energy to remove an electron from the K shell using the information given.
     
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