Physics
Beats
Calculates beat frequency f_beat = |f1 - f2|.
Related calculators
Doppler effect
Calculates f_obs = f_src*(v + s_o*v_o)/(v - s_s*v_s) for a stationary medium.
Wave equation
Solves v = f*lambda and returns period, angular frequency, and wave number.
Acoustic impedance
Calculates plane-wave characteristic acoustic impedance Z = rho*c.
Geometric spreading
Calculates free-field point-source level drop: L2 = L1 - 20*log10(r2/r1).
Sabine reverberation time
Calculates T60 = 0.161*V/A_eq and A_eq from surface and absorption-coefficient lists.
Sound intensity level
Calculates L_I = 10*log10(I/I_ref), by default relative to 10^-12 W/m².