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28a. Two speakers and a listener are located at positions A, B, and C as shown in the diagram to the right. Both speakers produce an identical 857.5 Hz tone on a 20° C day. Des the listener hear a loud sound, or agreatly diminished sound? Justify your answer with calculations and an explanation. 2.40m 28b. The speakers are now separated by 2.50 m and are vibrating exactly out of phase. These out-of-phase speakers produce the same tone of 551 Hz on the same 20° C day. If the listener is 2.88 m in front of speaker B, does he hear a loud sound, or a greatly diminished sound? Justify your answer with calculations and an explanation. 250 m 2.88 m 28c. Standing waves (this is not related to Problems 28a and 28b): A certain concert organ has a pipe that i open at both ends and 1.15 m long. On a day when the speed of sound is 350.2 m/s, what are the frequencies of the musical notes played in the 3d and 4th harmonics of a pipe?
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