1 / 7

Rutherford’s experiment

Rutherford’s experiment. Day 2. Last time. Discussion of early atomic model- the plum pudding model To refresh your memory: Large slightly positive mass with tiny negative electrons in it. Deconstructing Thomson’s model. You have A source of alpha particles (positively charged)

cathal
Download Presentation

Rutherford’s experiment

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. Rutherford’s experiment Day 2

  2. Last time • Discussion of early atomic model- the plum pudding model • To refresh your memory: • Large slightly positive mass with tiny negative electrons in it

  3. Deconstructing Thomson’s model • You have • A source of alpha particles (positively charged) • Some atoms of the same element (identical) • Detection device (to see where your alpha particles went) • How would you test Thomson’s model?

  4. Overview of the gold-foil experiment • Hans Geiger and Ernest Marsden shot helium nuclei (alpha particles, +2 charge) at a very thin sheet of gold foil • What do you think would happen, based on the plum pudding model?

  5. Rutherford’s experiment- online • http://phet.colorado.edu/en/simulation/rutherford-scattering • Make sure to click “show traces”

  6. 1) What effect does alpha particle speed have on repulsion? • 2) What does the size of the neutron have on repulsion? • 3) How does the relative proportion of protons to neutrons affect repulsion?

  7. Rutherford’s conclusions • How did this experiment change perceptions of what an atom is? • There is a nucleus with a positive charge (since the + charge must be concentrated) • Most of the atom is empty space!

More Related