Chapt 14 - Sound Waves Chapter 14 What Is Sound? Sound is a...

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1 Sound Waves Chapter 14 What Is Sound? c Sound is a disturbance that travels though a material medium c Air: Pressure disturbance c Solids: Vibrations of the lattice c v air = (331 + 0.60T C )m/s c Therefore at T = 20 o C we have c v air = 343 m/s = 1125 ft/s = 767 mph Vibrations Make Waves
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2 Sound Frequency Spectrum c Range of human response is 20 Hz to 20,000 Hz c Speech frequencies are mainly between 1000 Hz to 4000 Hz c Pigeon can hear 0.1 Hz Ultrasound c Region above 20 kHz is called ultrasonic c They travel well through solids and liquids c Reflect from solid objects c Uses c Echolocation c Medical Imaging Echolocation
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3 Ultrasound in Medicine Ultrasound in Medicine Speed of Sound in Various Media (typical values) c Remember Young’s Modulus “Y” for solids and Bulk modulus “B” for liquids? c Speed of sound in solids is given by v sol = sqrt(Y/ ρ ) c Speed of sound in liquids is given by v liq = sqrt(B/ ρ )
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4 Sound Intensity c Intensity = (energy/time)/area = power/area
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This note was uploaded on 01/05/2012 for the course PHYS 1401 taught by Professor Jamesr.boyd during the Spring '09 term at Collins.

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Chapt 14 - Sound Waves Chapter 14 What Is Sound? Sound is a...

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