Equations Flashcards
1
Q
Pure tone / harmonic motion equation (and meanings)
A
x (t) = A sin (w t + theta)
theta = phase w = angular frequency (w = 2 p f)
2
Q
Sound pressure equation (and meanings)
Relation between sound pressure and particle velocity
A
p¬s = v¬p x v¬s x Ro
p¬s = sound pressure v¬p = particle velocity v¬s = speed of sound propagation Ro = density of medium
3
Q
Speed of sound in air equation
A
c = 334 + 0.6 T
4
Q
Decibel equation (and meanings)
A
SPL = 20 log ( p / p¬0)
SPL = sound pressure level p = measured pressure p¬0 = reference pressure
5
Q
Photon energy equation (and meanings)
A
E = hv = hc/lambda
h = Planks constant c = velocity of light
6
Q
Transmission equation
A
T = Iout / Iin
7
Q
Absorptance equation
A
P = 1 - T
8
Q
Absorbance equation
A
A = -log¬10 (T)
9
Q
Weber-Fechner law **
A
d¬p = k dS / S
