PHYSICS 7E Lecture Notes - Lecture 10: Ideal Gas, Molar Mass, Gas Constant
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PHYSICS 7E Full Course Notes
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Physics 7e - lecture 10 - sound and hearing. Sound is simply any longitudinal wave in a medium. The audible range of frequency for humans is between about 20 hz and 20,000 hz. Ultrasonic sound waves have frequencies above human hearing and infrasonic waves are below. The harmonic content greatly affects our perception of sound. Pressure fluctuation versus time with fundamental frequency f 1 = 2. Pressure fluctuation versus time with fundamental frequency f 1 = 5. Sound can be described by a graph of displacement versus position, or by a drawing showing the displacements of individual particles, or by a graph of the pressure fluctuation versus position. The pressure amplitude is: ka pmax = b. B is the elastic modulus of air. = 0 p cos(kx y = a p = pmax sin(kx t) The speed of sound depends on the characteristics of the medium. B (fluid) v = v = (solid rod) v = m.
