本题目来源于试卷: gc textbook chapter 12 Sound，类别为 IB物理学
[问答题]
Two loudspeakers are at opposite endsz(l+1 lmpo eshd vejhm)/d5/5 of a railroad car as it moves x,wbm ,ps2aw.r7 lv h,past a stationary observer at 10 m/s as shown in Fig. 12–37. If the speakers have identical sound frequencies of 212 Hz, what is the beat frequency heard ,b.7rw,wm hvpl,2xsa 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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