 All sound is produced by  material sends through a thru  Frequency of = frequency of  Pitch =  High pitch = high  Low = low vibration frequency.

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Presentation transcript:

 All sound is produced by  material sends through a thru  Frequency of = frequency of  Pitch =  High pitch = high  Low = low vibration frequency  Range  Below 20 Hz =  Above 20,000 Hz =  Young person can hear

 Compression   Pulse of  Rarefaction  Closing door   Molecules away from

 All  Sound is in than in  Sound is  Sound cannot  No compression/expansion,  There can be without produced

 Do you hear thunder or see lightning first?  Speed of sound in dry is  increases speed  Each increase, speed of sound increases by  Speed of (~20°C) =  Speed of sound in a depends on, but on !!!

 proportional to the of a  objective 

 a sensation   BUT, related to  almost varies as the  unit =  increase of each = sound intensity increases by a  10 dB = 10 x as  20 dB = 10 x as ; 100 x as

Source of soundLevel (dB) Jet 30m140 Threshold of pain120 Loud rock music115 Old subway train100 Average factory90 Busy street traffic70 Normal speech60 Library40 Close whisper20 Normal breathing10 Hearing threshold0 TABLE 26.1; P394