本题目来源于试卷: gc textbook chapter 12 Sound，类别为 通用国际物理
[问答题]
Two loudspeakers are at oppos*w lhaa0sus( 5zaf x1mv9i u+bq362i eite ends ofczv* klhbq az87y,-zp6( ,hdz a railroad car as it moves past a stationary observer at 10 m/s as shown in Fig. 12–37. If the speakers have zhapk*c6 z,-7v,z 8q (bzdy hlidentical sound frequencies of 212 Hz, what is the beat frequency heard by the observer when (a) he listens from the position A, in front of the car, (b) he is between the speakers, at B, and (c) he hears the speakers after they have passed him, at C?
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