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Physics 120 1
Speed of Sound
Different in different materials
v = 331 m/s
in air at 00C and at 1 atm
temperature dependence
v = (331 +0.60 T) m/s
Physics 120 2
Characteristics of Sound
Loudness
intensity;
energy per area per time
Pitch
high or low
frequency
Audible range of human ear
20 Hz to 20,000 Hz
Physics 120 3
Decibels
Intensity of sound is measured in decibels
range of 1012 between intensity of quietest
and loudest sounds we can hear
ear hears on logarithmic scale
decibel - measure of intensity
Physics 120 4
Intensity
