Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Velocity of electron in a hoop

  1. Apr 25, 2010 #1
    1. The problem statement, all variables and given/known data
    An electron in a benzene molecule makes a reasonable approximation to an electron
    confined to a hoop. If the radius of the benzene molecule is about 5x10-10 m, and the
    electron has the lowest allowed angular momentum of h/2π, what is the velocity of the
    electron? (You may wish to recall the electron mass is 9x10-31 kg, and angular
    momentum is L = rp = rmv.)


    2. Relevant equations
    I'm not entirely sure.


    3. The attempt at a solution
    I'm in a really poorly run workshop based class, so we have no text book and the packets we were given are completely not at all helpful here.
     
  2. jcsd
  3. Apr 25, 2010 #2
    The two equations to use are in the problem.
     
  4. Apr 25, 2010 #3
    What do you use for n though?
     
  5. Apr 25, 2010 #4

    ideasrule

    User Avatar
    Homework Helper

    Where do you see n?
     
  6. Apr 25, 2010 #5
    "angular momentum of h/2π"
     
  7. Apr 25, 2010 #6
    Are you sure that is an n? I believe it is a pi.
     
  8. Apr 25, 2010 #7
    Oooh, my bad. Sorry! That completely threw me off - it looks like an n in the PDF. Now I just feel dumb, haha.
     
  9. Apr 25, 2010 #8

    ideasrule

    User Avatar
    Homework Helper

    It definitely is pi.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook