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

Sudden changes, what happens to particle?

  1. Jun 15, 2012 #1
    Let's say we have the typical ground state particle in a box. The box suddenly expands from 0 to A, to 0 to 2A.

    What happens to the wavefunction of the particle?
     
  2. jcsd
  3. Jun 15, 2012 #2

    Matterwave

    User Avatar
    Science Advisor
    Gold Member

    If the expansion is extremely fast, then the wave function remains the same as it was before and then slowly diffuses out according to the Schroedinger equation (it will no longer be in the ground state).

    If the expansion is slow (also called adiabatic) then the wave function remains in the ground state of the "new" box at each step in time, and ends up in the ground state.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook