EF 152 lecture notes

EF 152 lecture notes - Module 4, Lecture 1: Characteristics...

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EF 152 Springl, 2009 Lecture 4-1 2 Module 4, Lecture 1: Characteristics of Sound Speed of sound in air: (T in °C) () s m T v / 60 . 0 331 + For T = 20°C, v = 343 m/s = 767 mph _______: related to frequency Humans can respond to frequencies from about 20 Hz to 20,000 Hz Wavelength of sound: 20 Hz: 20000 Hz: EF 152 Springl, 2009 Lecture 4-1 3 Sound: Intensity and Loudness _________: sensation in human beings _________: Power per unit area perpendicular to wave Humans can detect sounds approximately in range of _______ to ____ W/m 2 Higher intensity levels can be heard, but are painful Loudness _____________ proportional to intensity To produce a sound twice as loud requires about ____ times the intensity EF 152 Springl, 2009 Lecture 4-1 4 Sound Level Sound intensity levels usually specified on a ___________ scale Common unit: bel, after Alexander Graham Bell More common is __________, or 1/10 bel 0 log 10 dB in I I = β •I 0 is a reference intensity, usually taken as the threshold of hearing, 1x10 -12 W/m 2 Threshold of hearing: A. -1 dbel B. 0 dbel C. 1 dbel D. 10 dbel Level of pain: EF 152 Springl, 2009 Lecture 4-1
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This note was uploaded on 04/07/2009 for the course EF 152 taught by Professor Ab during the Spring '08 term at University of Tennessee.

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EF 152 lecture notes - Module 4, Lecture 1: Characteristics...

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