gc textbook chapter 12 Sound (id: 18f86223e)

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]
Figure 12–32 shows vn)n5,gzu6durtn l- w-2z5d o4bpzaq0 arious phjbbyc9 :s 18ty a,q zn*/2vfzositions of a child in motion on a swing. A monitor is blowing a whistle in front of the child on the ground. At which position, A through E, will the child hear the highest frequency*2ab1n:zczy8 sh9,t q yv /bfj for the sound of the whistle? Explain your reasoning.

参考答案:
The highest frequency of sound will be heard at position C, while the child is swinging forward.  Assuming the child is moving with SHM, then the highest speed is at the equilibrium point, point C.  And to have an increased pitch, the relative motion of the source and detector must be towards each other.  The child would also hear the lowest frequency of sound at point C, while swinging backwards.


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