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 swjlfx *dx.(1 equippe)zquh*lt86j 9i j+ta5 a.lh8l w*u ptzd with the same single frequency horn. When 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 is the fr6t5t jj8. zwzt uli*apa)*hq+hl9 l8uequency the horns emit? Assume T = 20 $^{\circ} $C    Hz

参考答案: 120±2%


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