- #1
maverick280857
- 1,789
- 4
Hi everyone..
I'm trying to prove the following proposition:
The force exerted on the wall perpendicular to the x-axis by a particle of mass m contained in a rectangular box of dimensions a, b, c is given by the negative of the expectation of the derivative of the Hamiltonian wrt a:
[tex]F = -\left\langle \frac{\partial \hat{H}}{\partial a}\right\rangle[/tex]
But I can't see why I should differentiate with respect to the size of the box. Any ideas? This proposition is given in Landau/Lifgarbagez.
Thanks in advance.
I'm trying to prove the following proposition:
The force exerted on the wall perpendicular to the x-axis by a particle of mass m contained in a rectangular box of dimensions a, b, c is given by the negative of the expectation of the derivative of the Hamiltonian wrt a:
[tex]F = -\left\langle \frac{\partial \hat{H}}{\partial a}\right\rangle[/tex]
But I can't see why I should differentiate with respect to the size of the box. Any ideas? This proposition is given in Landau/Lifgarbagez.
Thanks in advance.