Acoustics
from ALS Chapter Six
Velocity of sound through air depends on the barometric pressure and altitude.
sound can be transmitted through water.
Sound frequency = (the pitch) is the number of cycles per second (cps), more commonly known as Herz thus 60 cps = 60 Hz
Square wave = sounds much like a buzzer or even an outboard motor
Acoustics uses logarithmic scales
Sound Intensity level = the decibel
Sound power level = measures the power at the source in watts/cm(squared)
Sound pressure level = pressure exerted by the sound wave on a surface at a given location.
IL and SPL have the same value.
two sound sources at 60 dB total IL of 63 dB not 120
Double distance from a sound source to receiver cuts the intensity to one quarter, change in only 6 dB
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