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Centripetal Force hydrogen atom

  1. Nov 17, 2015 #1
    In the Bohr model of the hydrogen atom,
    the speed of the electron is approximately
    2.18 × 106 m/s.
    Find the central force acting on the electron
    as it revolves in a circular orbit of radius
    5.02 × 10−11 m.
    Answer in units of N.
    Comment on Attempt:
    Ok I tried using the centripetal force formula of F=mv^2/r , but i wasn't given the mass. So i looked it up, the mass being 1.007, and it still wasn't the correct answer. I'm not sure if I need to somehow cancel out the mass with another formula, Thank you for helping :-)
  2. jcsd
  3. Nov 17, 2015 #2


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    Homework Helper
    Gold Member

    Hello and welcome to PF!
    Did you look up the mass of the electron or the mass of the hydrogen atom? Which one do you need? Also, make sure you find the value of the mass in SI units.
  4. Nov 17, 2015 #3
    YAY! Ok I misread and just found the mass of a hydrogen atom, not the electon, which is 9.1e-31 and when I plugged that into the equation it worked! I cannot tell you how happy I am right now, Thank You so much for replying to me, this made my day. Thank You again
  5. Nov 17, 2015 #4


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    Homework Helper
    Gold Member

    OK. Good work!
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