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Homework Help: Cuttoff frequwncy for an x-ray tube

  1. Apr 14, 2009 #1
    How would you calculate the cutoff frequency of an x-ray tube operating at 44kV? I am using frequency = work function/h. I have (44000eV x 1.602E-19J)/1.626E-34 but my answer is wrong. I'm thinking that I converted kV to eV incorrectly, but I'm not sure.
  2. jcsd
  3. Apr 14, 2009 #2


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    Your value for Planck's constant is wrong (that 1 should be a 6). Does that fix it?
  4. Apr 14, 2009 #3
    Yes. Thanks for pointing out my stupid mistake :) Sometimes it just takes a fresh set of eyes.
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