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absorption acoustical impedance acoustical mass acoustical resistance acoustical resonator amplitude aperture apparatus applied basilar membrane calibration centre circuit coefficient condenser transmitter constant cross-section curve cycles per sec decay factor decibels diameter diaphragm displacement distance effect electrical electrical impedance equation force free air frequency characteristic Gamgee tissue harmonic horn impedance per unit inertia instantaneous value instrument loud speaker low frequencies magnitude measurement mechanical impedance mechanical resonance mechanical system membrane method modes of vibration motion noise obtained open end phase piston plane wave position quantity quency radiation radiation of sound radius ratio Rayleigh disk reactance reflection factor resonant frequency result reverberation simple small as compared small source sound energy sound pressure sound wave source of sound speech stationary wave surface telephone receiver tion tone transient distortion tube uniform unit area variations velocity velocity potential viscosity wall wavelength zero