Sound - 5 16-3. Sound Intensity (Loudness) ) / ( eter in...

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Liu UCD Phy9B 07 1 Ch 16. Sound & Hearing
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Liu UCD Phy9B 07 2 16-1. Sound Waves Frequency: Pitch Audible range: 20Hz - 20,000Hz Ultrasonic: f > 20,000 Hz, Sonar NOT Supersonic (speed > sound speed) Infrasonic: f < 20 Hz Earthquake
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Liu UCD Phy9B 07 3 Longitudinal Wave Pressure fluctuation extremes Zero displacement Zero pressure fluctuation Displacement extremes
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Liu UCD Phy9B 07 4 16-2. Speed of Sound Depends on Propagating material Temperature Same for all frequencies, and v= λ f In air, at 20ºC, v ~340 m/s Please read text on your own. Faster in solids than in liquids and gases
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Liu UCD Phy9B 07
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Unformatted text preview: 5 16-3. Sound Intensity (Loudness) ) / ( eter in watts/m , area power area e energy/tim I Intensity 2 2 m W = = Intensity level: (in dB)=10 log (I/I ) I =1.0x10-12 W/m 2 , =0, Threshold of hearing I=1W/m 2 , =120 dB, Threshold of pain 10 dB increase in intensity level ~ 10 times increase in intensity doubling in loudness Liu UCD Phy9B 07 6 Log Exercise log a = log 10 a if log a=x, then a=10 x log a b = b log a log a + log b = log ab log a - log b = log (a/b) log 1=0 log 10 =1 log 100 = log 10 2 =2 log 10 =2...
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Sound - 5 16-3. Sound Intensity (Loudness) ) / ( eter in...

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