waves what is a wave? a disturbance transmits energy not matter through matter and space...
Post on 20-Dec-2015
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![Page 1: Waves What Is a Wave? A disturbance Transmits energy not matter Through matter and space Medium-matter through which a wave travels Sound waves require](https://reader036.vdocument.in/reader036/viewer/2022062313/56649d425503460f94a1d05a/html5/thumbnails/1.jpg)
Waves
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What Is a Wave?A disturbanceTransmits energy not matterThrough matter and space
Medium-matter through which a wave travelsSound waves require a medium
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Waves Transfer EnergyWaves can do work
ExamplesSand Eardrum
• Eye, photo film
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Sound When sound travels in the air, the waves spread out as spheresAs they travel outward they get bigger
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Longitudinal Wave
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Vibrations of the drum head create sound waves in the air
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Sound Waves Are Pressure Waves
Pressure nodes appear symmetrically at each endOpen to the atmosphere
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Standing Wave
Fundamental frequency for each pipeWavelength = = 2LFrequency = f = v / 2LShorter the length higher the frequency
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Harmonics
= L
f = v / L
Even numbered multiples of the fundamental
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Pitch
Large wavelength ->Low frequency ->Low pitchSmall wavelength ->High frequency ->High pitch
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Moving Sound SourceAs the source of a wave movesThe wave fonts bunch up in frontSpread out behind
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The Doppler Effect
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What if the disturbance is traveling at the same speed as the wave fronts?
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What if the disturbance is traveling faster than speed of the wave fronts?
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Bow Wave
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Bow Waves
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Period
Time required for a full wavelength to passSymbol is TSI unit is seconds
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FrequencyFrequency measures the rate of vibrations
periodfrequency
1
Tf
1
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Frequency
Number of vibrations that occur in an 1 sec time interval
Period – the time required for one full wavelength to pass a certain point