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Velocity of atomic (hydrogen) electrons

  1. May 2, 2008 #1

    I've been wondering about the velocity of hydrogen electrons. I've read that 242,000 m/s was the correct velocity, however, I thought electrons would travel at c. How does one calculate this number?

    Thanks in advance.
  2. jcsd
  3. May 3, 2008 #2


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    Why would/should electrons travel at c?

    One can measure/calculate the mean momentum & kinetic energy of the atomic electron, then it is trival to obtain its velocity.
  4. May 3, 2008 #3


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    mv^2=27 eV, so [tex]v/c=\sqrt{27/500,000}[/tex]
  5. Jul 6, 2008 #4
    Can you explain that equation, if you get a chance? Why does mv^2=27ev
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