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Waves, Oscillations & Acoustics

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Waves, Oscillations & Acoustics

Absorption Coefficient

The fraction of incident sound energy absorbed by a material surface rather than reflected.

α = I_absorbed / I_incident (0 ≤ α ≤ 1) Dimensionless
Waves, Oscillations & Acoustics

Acoustic Impedance

The physical opposition offered by a medium to sound wave flow, defined as ratio of acoustic pressure to particle velocity.

Z = ρ v_sound Pa·s/m (Rayls)
Waves, Oscillations & Acoustics

Acoustic Power

The total sound energy emitted by an acoustic source per unit time in all directions.

P_ac = ∫ I · dA = 4π r² I W
Waves, Oscillations & Acoustics

Acoustic Resonance

The amplification of sound waves within a hollow cavity or tube when driven at frequencies matching cavity standing wave modes.

f_n = n v / (2 L) Hz
Waves, Oscillations & Acoustics

Angular Frequency

A scalar measure of rotation or oscillation rate expressed in radians per unit time.

ω = 2π f = 2π / T rad/s