Acoustics Flashcards
1
Q
Formula for speed of sound
A
C = Sqrt ( elasticity / density )
Or
C = f/lambda (wavelength)
2
Q
Formula for Impedance
A
Z = density x speed of sound
3
Q
Formula for SOUND PRESSURE LEVEL
A
20log(p/2x10^-15)
P = sound pressure of a wave
4
Q
Formula for INTENSITY LEVEL
A
IL = 10log(I/10^-12)
I = intensity of a sound wave
5
Q
Formula for SOUND POWER LEVEL
A
SPL = 10log(W/10^-12)
W = power
6
Q
Formula for Absorption Coefficient
A
(Incident - reflected) / incident
I = sound intensity
7
Q
Formula for Insulation
A
20 log (pi.frequency.mass of wall)/pc
8
Q
Transmission loss
A
20 log (W.M/2pc)
