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Chapt 14

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

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1 Sound Waves Chapter 14 What Is Sound? circle6 Sound is a disturbance that travels though a material medium circle6 Air: Pressure disturbance circle6 Solids: Vibrations of the lattice circle6 v air = (331 + 0.60T C )m/s circle6 Therefore at T = 20 o C we have circle6 v air = 343 m/s = 1125 ft/s = 767 mph Vibrations Make Waves

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2 Sound Frequency Spectrum circle6 Range of human response is 20 Hz to 20,000 Hz circle6 Speech frequencies are mainly between 1000 Hz to 4000 Hz circle6 Pigeon can hear 0.1 Hz Ultrasound circle6 Region above 20 kHz is called ultrasonic circle6 They travel well through solids and liquids circle6 Reflect from solid objects circle6 Uses circle6 Echolocation circle6 Medical Imaging Echolocation
3 Ultrasound in Medicine Ultrasound in Medicine Speed of Sound in Various Media (typical values) circle6 Remember Young’s Modulus “Y” for solids and Bulk modulus “B” for liquids? circle6 Speed of sound in solids is given by v sol = sqrt(Y/ ρ ) circle6 Speed of sound in liquids is given by v liq = sqrt(B/ ρ )

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4 Sound Intensity circle6
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