Chapter14_FA05

# Chapter14_FA05 - Waves and Vibrations Chapter 14 Waves are...

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Waves and Vibrations Chapter 14 Waves are all around us in everyday life.

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Sound is a Wave.
Radio, TV, and Cell Phones use waves.

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Light is a wave.* *But it can act as a particle… another story in Physics!
Main concepts Types of waves: Transverse: waves on strings Longitudinal: sound waves water waves are more complex (combination) Relationship of wavelength, frequency and velocity of wave ( λ f= v ) Wave amplitudes can be added together. Addition of waves leads to interference: constructive or destructive

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Motion of a Transverse Wave on a string Wave amplitude is y=Asin[2 π ( x / λ - ft )] If you sit at one location x , the wave oscillates in time. If you stop the action at a time t , the wave oscillates as a function of distance x . The wave crest travels a distance λ in one period of time, 1/f. Thus the speed is the distance over the time, or λ f=v
Motion of Longitudinal Wave Pressure wave Oscillation of local pressure and gas density Wavelength

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Water waves combine motions Complex motion: combination of transverse and longitudinal motion.
Electric Field (and Magnetic Field) move TRANSVERSE to direction of propagation of energy. + + + + + + - - - - - - Antenna

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Key characteristic of these waves Energy (in the form of motion) can be transmitted by the wave The medium (the string, the air, the water) does not move at the speed of the wave—it
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## This note was uploaded on 08/16/2011 for the course PHY 2053 taught by Professor Vellaris during the Fall '08 term at University of Central Florida.

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Chapter14_FA05 - Waves and Vibrations Chapter 14 Waves are...

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