gc textbook chapter 12 Sound (id: 83bf0959d)

本题目来源于试卷: gc textbook chapter 12 Sound，类别为 通用国际物理

[填空题]
Two automobiles are equipped with the same single frequency fbur5 js5tr6. uo4o*gxplr5w:kb 6+ohorn. When r:ytjpwk6*8 c;tc: d4njuh(h one is at rest and the other is moving toward the first at 15 m/s the driver at rest hears a beat frequency of 5.5 Hz. What r:8htpc u yjt4(w*c d:k n6;jhis the frequency the horns emit? Assume T = 20 $^{\circ} $C    Hz

参考答案: 120±2%


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