Acoustic Resonance
The amplification of sound waves within a hollow cavity or tube when driven at frequencies matching cavity standing wave modes.
Governing formula
f_n = n v / (2 L)
SI unit
Hz
In depth
Air inside the cavity vibrates in standing wave patterns, reinforcing specific acoustic frequencies while dampening others.
Examples in the real world
Blowing across the top of a glass bottle to produce a clear resonant musical tone, or the body cavity resonance of an acoustic guitar.