Chapter16 - PHYS276, S09 Chapter 16 1 Chapter 16: Wave...

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Unformatted text preview: PHYS276, S09 Chapter 16 1 Chapter 16: Wave Motion Demos: http://www.physics.umd.edu/deptinfo/facilities/lecdem/lecdem.htm G3-27: air table transverse and longitudinal waves G3-01 Shive Wave Machine traveling Waves G3-28 suspended slinky G3-03 shive wave machine reflection of pulses G3-05: partial reflections shive machine Thanks to Prof LaPorta and Peer Instruction by Eric Mazur Waves PHYS276, S09 Chapter 16 2 Propagation of some kind of disturbance (displacement from equilibrium value): pressure, displacement, electromagnetic field . Well study mechanical waves in this section. source (hand, an oscillating charge, etc) a media for the wave to propagate in (a solid, a gas, a spring, a string). The wave is a LOCAL motion of the particles that make up the media (except E&M) some kind of coupling between particles in the media produces the propagation in E&M waves, which does not require a media, its a coupling between the electric and magnetic field) Examples of waves sound light vibrations in tense strings probability waves (quantum mechanics) Definitions and Language PHYS276, S09 Chapter 16 3 a disturbance propagates through the media with a speed that is generally a fixed property of that media transverse wave: direction of disturbance is perpendicular to the direction of propagation (plucked string under tension) longitudinal wave: direction is along the direction of propagation (sound waves, compression in spring) Speed of Wave PHYS276, S09 Chapter 16 4 The disturbance is a function of the position within the media and the time. It moves through the media with a characteristic (of the media) speed v....
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Chapter16 - PHYS276, S09 Chapter 16 1 Chapter 16: Wave...

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