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Unformatted text preview: 1 Mar. 21, 2007 Phy107 Lecture 24 1 Course Essay 500-750 word typed essay due Wed. May 2 First deadline: Wed. next week (Mar. 28) turn in Topic and Paragraph Description Topic ideas: Nobel prize winner: work & importance Big science project: mission & successes Bogus or contentious science: any scientific support? Science topic: achievements and outlook See course web site for details and resources Title / paragraph example Topic: Quantum Computers Paragraph: Over the last decade, scientists have developed new approaches to computing using basic ideas of quantum mechanics. Individual atomic particles are used as bits of a computer, but instead of representing only 0 and 1, the quantum-mechanical wavefunction is used to simultaneously represent an infinitely variable range of values. Description of topic Outlook What else I will write Science aspect Mar. 21, 2007 Phy107 Lecture 24 3 From Last Time Light shows both particle and wavelike properties Interference is an example of wavelike props. Photons are particles of light in the particle-like description. An Experiments demonstrating this was Photoelectric effect Mar. 21, 2007 Phy107 Lecture 24 4 Nobel Trivia For which work did Einstein receive the Nobel Prize? A. Special Relativity: E=mc 2 B. General Relativity: gravity bends Light C. Photoelectric Effect & Photons Mar. 21, 2007 Phy107 Lecture 24 5 Photoelectric effect summary Light is made up of photons, individual particles, each with energy hf One photon collides with one electron- knocks it out of metal. If photon doesnt have enough energy, cannot knock electron out. Intensity ( = # photons / sec) doesnt change this. Minimum frequency (maximum wavelength) required to eject electron = hc " = 1240 eV # nm " Mar. 21, 2007 Phy107 Lecture 24 6 Photoelectric effect question A scientist is trying to eject electrons from copper by shining light on it, but none are coming out....
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This note was uploaded on 01/05/2012 for the course PHYS 107 taught by Professor N/a during the Spring '08 term at Wisconsin.
- Spring '08