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acoustic wave amplitude angle approximately architectural acoustics assumed audible auditorium binaural beats caused change of phase chapter combinational tone components compression condition conical horn considered curves decibels depends diffraction direction discussion displacement distance equal experiment fact flow of energy fundamental hearing helix Helmholtz resonator Hence horizontal incident wave increase intensity length longitudinal waves loudness maximum medium megaphone motion natural frequencies nodes observed obtained occurs one-half wave-length open end opposite in phase orifice overtones particles perpendicular phenomenon Physical Review pipe pitch plane wave position pressure produced propagation quency ratio reflected wave reflector refracted region relative represented resonance reverberation Section shown in Fig shows sound wave source of sound speech stationary waves string surface temperature tion tone total reflection transmission transverse waves tube tuning fork variation velocity of sound vibration violin voice vowel vowel sounds wall wave front wind wire zero