period one
Fundamentals of Sound
notes
Wavelength
one cycle
speed of sound
wavelength = frequency
Figure 5
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:
speed of sound wavelength =
frequency
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 = | = 5.6 ft | |
| 200 Hz |
|
æwavelength = | = 1.7 mö | |
è | 200 Hz | ø |
4 |
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