You are sitting near the back of a twin-engine com- mercial jet, which has the engines mounted on the fuselage near the tail. The nominal rotation speed for the turbofan in each engine is 5200 revolutions per minute, which is also the frequency of the dominant sound emitted by the engine. What audio clue would suggest that the engines are not perfectly synchronized and that the turbofan in one of them is rotating approximately 1% faster than that in the other? How would you measure this effect if you had only your wristwatch (could measure time intervals only in seconds)? To hear this effect, go to http://qbx6.ltu.edu/s_schneider/physlets/main/ beats.shtml. This simulation works best with integer natural frequencies, so round your frequencies to the ones place.
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