Adiabatic Change and Work

  • Thread starter Prathyush
  • Start date
  • #1
142
11

Main Question or Discussion Point

Is work done by the external agency when an adiabatic change in the Hamiltonian is performed on some State ψ?
 

Answers and Replies

  • #2
1,006
104
Yes. We don't even need to restrict ourselves to adiabatic changes here. The change in energy of the system is the work done on the system, in classical or in quantum mechanics, essentially by definition.
 
  • #3
142
11
Yes What I am confused about is if the state is superposition of energy levels, we have no adequate definition of Energy of the system.
 
  • #4
142
11
I have thought of a specific situation to illustrate my problem.
Consider the case of a Particle in a infinite well, If the walls are compressed slowly and state is in a superposition of first and second excited levels, What is the work done on the walls?
One can say that the work done is the change in expectation value of the energy, But why should it be so?
 
Last edited:

Related Threads for: Adiabatic Change and Work

Replies
1
Views
506
  • Last Post
Replies
0
Views
1K
Replies
1
Views
12K
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
1
Views
3K
Replies
14
Views
1K
Replies
4
Views
832
  • Last Post
Replies
1
Views
3K
Top