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In acoustics, particle acceleration is the acceleration (rate of change in speed and direction) of particles[clarification needed] in a sound transmission medium. When sound passes through a medium it causes particle displacement[1] and as such causes changes in their acceleration.
The acceleration of the air[dubious – discuss] particles of a plane sound wave is given by:
Symbol | Units | Meaning |
---|---|---|
a | m/s2 | particle acceleration |
v | m/s | particle velocity |
δ | m, meters | particle displacement |
ω = 2πf | radians/s | angular frequency |
f | Hz, hertz | frequency |
p | Pa, pascals | sound pressure |
Z | N·s/m3 | acoustic impedance |
J | W/m2 | sound intensity |
E | W·s/m3 | sound energy density |
Pac | W, watts | sound power or acoustic power |
A | m2 | area |
An Introduction to the Theory of Optics By Arthur Schuster.
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