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Chapter16 - PHYS276 S09 Chapter 16 1 Chapter 16 Wave Motion...

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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 . We’ll 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, it’s 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 Motion...

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