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acceleration acoustic alternating current amplitude auditorium bead beats calculated cm./sec combination tones complex tone compression constant corresponding curve of Fig cycles per second density diaphragm difference tone direction displacement amplitude distance dyne effect elasticity emitted energy equation executing simple harmonic force fundamental frequency hearing hence intensity level length listener longitudinal wave loudness level mass maximum measured medium method microphone microwatt modes of vibration moving observer oscillator overtones particle velocity phase piezoelectric pipe pitch pressure variation produced prong pure tone quartz quency radiation pressure rarefaction ratio Rayleigh disc reflected wave represent result reverberation root mean square sensation level simple harmonic motion simple harmonic wave sound wave source of sound speech level square centimeter stationary wave string temperature threshold of audibility tion transverse wave tube tuning fork velocity of sound wall wave trains wave traveling wavelength Young's modulus zero