1 / 4

Lecture 12-- CALM

Lecture 12-- CALM.

chesmu
Télécharger la présentation

Lecture 12-- CALM

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Lecture 12-- CALM • The so-called two-level system is a model that finds many uses in physics. In this model, the system is assumed to have only two states in which it can exist, and these states are separated in energy by an amount Δ . Consider a situation in which such as system in which Δ is 0.02 eV is in thermal contact with a temperature reservoir at temperature T. At what value of T will the system be half as likely to be in the upper level as it is to be in the lower level? • ~335 K from ln(0.5)=-D/kT(5 answers). • Other (5 answers). • No answer: 8

  2. Chapter 5 Example

  3. Chapter 5 Example Let’s consider the particle in a box problem yet again. The energy levels are given by (we’ll take the box to be a cube of side L): e(nx,ny,nz) = (h2/8mL2)[ nx2 + ny2 + nz2] (4.5) What is the ratio of the probabilities for the particle to have each of the three lowest energies in this model? What is the temperature at which each of these ratios would start to vary appreciably for the case of an electron confined in a cube with L=10nm?

  4. Correction to HWA#5 Q3

More Related