Lecture3 - PHY102 1 Major Concepts in Physics Lecture 3....

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Unformatted text preview: PHY102 1 Major Concepts in Physics Lecture 3. Prof Simon Catterall Office 309 Physics, x 5978 [email protected] http://physics/courses/PHY102.08Spring PHY102 Today … ¡ Announcements ¡ Interference – why light is a wave! ¡ Phase difference, constructive and destructive interference ¡ Examples: sound, Young’s double slit experiment, thin films PHY102 Clickers ¡ We will NOT be using clickers this semester ¢ Registration costs ¢ Unnecessary since do not plan to use for grading ¡ If anyone has bought one for this semester you should return it to the bookstore. ¡ Instead use flashcards PHY102 Homeworks etc ¡ Collect homework 1 in workshop this week. ¢ Due 2 weeks from now in workshop PHY102 Interference ¡ Phenomena that results from applying principle of superposition to (usually) 2 coherent sources of waves ¡ Typically waves originate from two different locations PHY102 Coherence ¡ Two waves are coherent if they maintain a fixed phase relationship to each other PHY102 Phase ¡ Phase difference is the angle (in radians) between corresponding wave crests ¡ If phase difference is ¢ 0 or multiple of 2 π – constructive interference ¢ π or odd multiple – destructive interference ¡ Typically independent sources are NOT coherent – eg. do NOT see interference from 2 light bulbs …. PHY102 The resulting amplitude and intensity are: 2 1 2 1 2 1 2 I I I I I A A A + + = + = PHY102 The resulting amplitude and intensity are: 2 1 2 1 2 1 2 I I I I I A A A − + = − = PHY102...
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This note was uploaded on 05/18/2008 for the course PHY 102 taught by Professor Simoncatterall during the Spring '08 term at Syracuse.

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Lecture3 - PHY102 1 Major Concepts in Physics Lecture 3....

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