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Published byDamian Cannon Modified over 6 years ago
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Wavelength Distance between two successive condensations or rarefactions. Distance between successive identical points in the waveform. 1
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Other terms Pressure = Force/Area; Unit: Newton/meter2 , dyne/centimeter2 or Pascal (Pa) Energy = Ability to do work; Unit: Joule Power = Energy/Time; Unit: Joule/Second or watt 2
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Sound intensity in terms of power
Amount of energy transmitted per second over an area of one square meter Unit: watt/meter2 or w/m2 3
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Normal human hearing in terms of power
Least amount of sound power that can be detected: 10-12 w/m2 or w/cm2 Sounds that are damaging to the ear: 102 w/m2 or 10-2 w/cm2 4
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Bel and Decibel 1 Bel = 10 Decibels
Logarithmic units of sound intensity Bel = log (I1/I0) Decibel = one-tenth of a Bel, i.e. 1 Bel = 10 Decibels 5
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Rules of exponents Xn = X x X x X …….n times X-n = 1/ Xn X0 = 1 6
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Laws of Exponents Xa x Xb = X a+b Xa/Xb = X a-b ( Xa)b = Xab 7
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Logarithm Question: To what power must a known base be raised to obtain a certain value? 2? = 8 23 = 8 is the same as Log28 = 3 8
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Laws of Logarithms log a * b = log a + log b log a/b = log a – log b
log (a)b = b * (log a) log 1/a = - log a 9
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log 10 = 1 log 2 = log 3 = 0.48 log 7 = 0.85 10
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