April 2007 page 2 Atoms and Quantum Mechanics Computer Lab PHY 152/162

_____ 4. http://www-tech.mit.edu/Chemicool/ Periodic Table

Click on an element box to learn about it.

When was Radium (Z = 88) discovered? when ______________

_____ 5. http://www.slac.stanford.edu/pubs/beamline/30/2/30-2-carson.pdf

The historical account of the development of Quantum Mechanics

______ 6. http://www.phys.uri.edu/~yoon/heisenbergmain.html

Heisenberg Uncertainty Principle. Focus your attention on the top left graph and the top right graph. The top left graph indicates the relative probability of finding the particle in the interval shown on the horizontal axis. The graph on the right shows the size of the uncertainty of the momentum. A small uncertainty in momentum indicates that the velocity of the object is known accurately. When the top left graph has a broad distribution (not a narrow peak) it indicates that the position of the particle is poorly known. The slider bar for Width controls the uncertainty in the momentum (velocity) of the particle. Describe what happens to the uncertainty of the position of the particle as the velocity of the particle becomes less uncertain.

______ 7. http://www.phys.hawaii.edu/~teb/optics/java/atomphoton/index.html

Absorption and Emission

Describe what happens to an electron when it absorbs a photon.

_____ 8. PHY162 Only http://members.kr.inter.net/joo/p hysics/curriculum/quantumMe/hydrogen/hatom.html

This page will give you a feeling for the mathematics involved in discussing the hydrogen atom.

Next Week: Turn in this sheet and a one paragraph summary for a magazine or Internet article which is related to one of these topics:

Bohr Theory of Hydrogen Atom, Dual Nature of Light, Holograms, Matter Waves, Heisenberg Uncertainty Principle, Electron Microscope

Give the magazine reference (name, date, page) or the URL of the Internet site.