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4 TRG-TRC007-EN
notes
period one
Fundamentals of Sound
The wavelength of the sound is the linear measurement of one complete
cycle. The wavelength and frequency of a sound are related by using the
following equation:
The speed of sound transmission is a physical property of the medium. For air,
the speed varies slightly with temperature change. Because the temperature
range encountered in the study of HVAC acoustics is relatively small, the speed
of sound can be considered a constant 1,127 ft/s (344 m/s). For example, sound
traveling through the air at a frequency of 200 Hz has a wavelength of 5.6 ft
(1.7 m).
Wavelength
one cycle
one cycle
frequency
frequency
wavelength
wavelength
=
=
speed of sound
speed of sound
Figure 5
wavelength
speed of sound
frequency
-------------------------------------------
=
wavelength
1,127 ft/s
200 Hz
-------------------------
= 5.6 ft=
wavelength
344 m/s
200 Hz
--------------------- -
1.7 m==
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