1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Please help! Ground State Energy Problem!

  1. Apr 19, 2009 #1
    1. The problem statement, all variables and given/known data

    The particle in a box model is often used to make rough estimates of ground state energies. Suppose that you have a neutron confined to a one-dimensional box of length equal say 1 x 10^-14m. What is the ground state energy of the confined neutron?

    answer in MeV?



    2. Relevant equations

    En = h^2/8mL^2



    3. The attempt at a solution

    I am getting the wrong answer... I am getting:

    (6.626e-34)^2/((8)(1.675e-27)(1e-14)^2) = 3.28e-13

    That is wrong... anyone?
     
  2. jcsd
  3. Apr 19, 2009 #2

    Pengwuino

    User Avatar
    Gold Member

    Do you know the actual answer? Are you expressing it in MeV?
     
  4. Apr 19, 2009 #3
    I don't have the answer, I have to submit electronically and I am getting it wrong.

    I'm not sure actually....that was my issue...maybe I am not converting to MeV. Any ideas?
     
  5. Apr 19, 2009 #4

    Pengwuino

    User Avatar
    Gold Member

    Remember, planck's constant that you applied is in J*S. Thus your units is in joules. Convert your answer to MeV :)
     
  6. Apr 19, 2009 #5
    Well, I multiplied my answer by 6.24e12 because 1J = 6.24e12MeV, and I got 2.05, that is still wrong.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Please help! Ground State Energy Problem!
Loading...