Calculation Of The Speed Of Sound; Calculation Of Wavelength - PROEL AXIOM - VERSION 2.0 Manual

Appendix C
Useful Formulae and Tables
In this appendix we review some formulae and reference tables useful in the everyday use of the AXIOM
vertical array system.
C.1 Calculation of the speed of sound
The velocity of the propagation of sound c in air depends fundamentally on the temperature according
to the formula:
where T is temperature in
C.2 Calculation of wavelength
Wavelength λ is a function of frequency and the speed of sound according to the following formula:
where c is the speed of sound and f is frequency.
The following table provides some examples of wavelength based on a temperature of 21
therefore the speed of sound c = 344 [ m / s ]:
c = 331.4 + 0.6 · T
◦
C.
λ =
f [Hz]
20
31.5
63
125
250
500
1k
2k
4k
8k
16k
20k
m
s
c
[ m ]
f
λ [m]
17.2
10.9
5.46
2.75
1.38
0.688
0.344
0.172
0.0860
0.0430
0.0215
0.0172
101
◦
C and