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absorption acoustical impedance acoustical mass acoustical resistance acoustical resonator alternating Alternating Current amplitude aperture apparatus applied B.Sc basilar membrane calculated calibration centre circuit coefficient condenser transmitter constant cross-section curve cycles per sec decay factor diameter diaphragm displacement distance effect electrical electrical impedance Engineering equation example force free air frequency characteristic harmonic horn impedance per unit inertia instantaneous value instrument loud speaker low frequencies magnitude measurement mechanical impedance mechanical resonance mechanical system membrane method motion noise obtained open end phase piston plane wave position practical quantity quency radiation radiation of sound radius ratio Rayleigh disk reactance reflection factor resonant frequency result reverberation simple small as compared 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 wall wavelength zero