A loudspeaker of area S = 0.01m2 is placed at the end of a long tube, as shown at the top of the next page. Assume the other end of the duct has an anechoic termination, i.e. no reflected waves. The flat speaker cone undergoes harmonic motion at frequency 1000 Hz producing SPL = 80 dB re. 2x10-5 N/m2 in air everywhere in the tube.
(a.) Find the mean-square pressure in the tube (why is it independent of position?).
(b.) For the free progressive sound wave propagating in the tube, with air at 60oF, find
c, p, p/Po,?!
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