Physics
Standing wave on a string
Calculates speed v = sqrt(Tension/mu_L) and harmonic frequency f_n = n*v/(2L).
Related calculators
Beats
Calculates beat frequency f_beat = |f1 - f2|.
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.