1 / 14

Quantization

Quantization. In spite of the many successes of classical physics, experiments began to discover phenomena that were difficult to understand. Electron e/m. Cathode ray tube. Electron e/m. Electron e/m. Electron e/m. This experiment established the electron as a particle

bmeyer
Télécharger la présentation

Quantization

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. Quantization • In spite of the many successes of classical physics, experiments began to discover phenomena that were difficult to understand

  2. Electron e/m • Cathode ray tube

  3. Electron e/m

  4. Electron e/m

  5. Electron e/m • This experiment established the electron as a particle • The present value of e/m is • e/m=1.76x1011 C/kg

  6. Line Spectra • Recall from optics how a diffraction grating works

  7. Line Spectra

  8. Line Spectra

  9. Charge Quantization

  10. Charge Quantization

  11. Charge Quantization • The oil drop experiences a downward gravitational force (mg) and an upward frictional force (bv) • The terminal velocity of the falling oil drop is • The viscous force is given by Stokes’ law with • The mass is given by

  12. Charge Quantization • With the addition of an electric field we have • The terminal velocity for rising is just • And thus

  13. Charge Quantization • Millikan observed that the charge on the drops was always ne where n is an integer • The present value of e is 1.602x10-19C

  14. Charge Quantization • Millikan’s measurement was not without controversy • Some charge he only used the “best” data • This is almost exactly right & the best one I ever had!!! • Exactly right • Publish this Beautiful one • Error high will not use • Too high by 1½% • His graduate student came up with the idea of using oil (but was not co-author on the paper)

More Related