class14 - Announcements Reading for Monday: 4.4 4.7 Online...

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Announcements • Reading for Monday: 4.4 – 4.7 • Online questionnaire due next Wednesday (see assignment section on the web) Today: We continue our little excursion to the particle-wave duality Summary from last class The photoelectric effect: Light shines on metal. Electrons are emitted. Is it just a heating effect? We argued that the light could simply heat up the plate electrons pop-out Measure the current! 0 Battery Voltage Current We found an interesting U-I curve HOT! ? # of electrons sec current is constant = constant Does this U-I graph look familiar to you? (Any EE majors in the room?) reverse V, no electrons flow. Vacuum tube diode ent Curren reverse V, no electrons flow. voltage
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Swimming Pool Analogy If no water slops over side of pool, no flow. Little pump or big pump, still no water current. If electrons stuck inside metal plate, no current for little or big V. pump Pool party: put bunch of energy into water, splash some out, get flow through pump. Put energy into metal by heating it very hot,
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This note was uploaded on 08/24/2010 for the course PHYS 2130 taught by Professor Staff during the Spring '08 term at Colorado.

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class14 - Announcements Reading for Monday: 4.4 4.7 Online...

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