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Homework Help: Revolutions of an electron

  1. Mar 28, 2007 #1
    1. The problem statement, all variables and given/known data

    A hydrogen atom exists in an excited state for typically 5.79 ns. How many revolution would an electron make in the n=2 state before decaying?

    2. Relevant equations
    Ao=.053 nm

    3. The attempt at a solution
    Rn=4*.053=.212 nm (don't know what purpose this serves)
    v= 594.8 m/s
    distance= v*t
    d= 594.8*5.79E-9s= 3.444 E-6 m
    circumfrance- 2*pi*r= 2*3.14*.212E-9m=1.332E-9 m
    d/circumfrance= 2585.5 revolutions

    This is wrong, can someone help me?
  2. jcsd
  3. Mar 28, 2007 #2


    User Avatar
    Science Advisor
    Homework Helper

    You put a wrong value for the mass of the electron. It should be 9.1 E-31 kg.
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