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Circular Motion with a hydrogen atom

  1. Nov 16, 2009 #1
    1. The problem statement, all variables and given/known data
    In the Bohr model of the hydrogen atom, the speed of the electron is approximately 2.01e6 m/s.
    Find the central force acting on the electron as it revolves in a circular orbit of radius 4.84e-11 m.
    Answer in units of N.


    2. Relevant equations

    Fc=m*v^2/R

    3. The attempt at a solution
    I said that the mass was 1.674e-27 kg. If i should use another number, please let me know.

    Fc=m*v^2/R
    Fc=(1.674e-27)*(2.01e6)^2/(4.84e-11)
    Fc=1.39e-4

    When I submit this answer to UTexas (an online HW service) it says that I am wrong. I have done this problem several times and keep getting the same thing.

    Thanks!
     
  2. jcsd
  3. Nov 16, 2009 #2

    hage567

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    Homework Helper

    You are not using the right value for the mass.
     
  4. Nov 16, 2009 #3
    What is the correct value for the mass?
    I looked it up on Google and that is what I found.

    Thanks.
     
  5. Nov 16, 2009 #4

    hage567

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    Homework Helper

    You are looking for the mass of an electron. Is that what you googled?
     
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