gc textbook chapter 12 Sound (id: d041bfd00)

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]
A factory whistle emits sound of fregn hx)wi9 b i)nf(77ywquency 570 H t wg:3stw1qx:z. When the wind velocity is 12 m/s from the north, what frequency:t w1wsx:tg3 q will observers hear who are located, at rest,
(a) due north,   Hz
(b) due south,   Hz
(c) due east,    Hz
(d) due west, of the whistle? What frequency is heard by a cyclist heading    Hz
(e) north    Hz
(f) west, toward the whistle at 15 m/s?   Hz
Assume T = 20 $^{\circ} $C

参考答案:
空格1: 570±2%  空格2: 570±2%  空格3: 570±2%  空格4: 570±2%  空格5: 594±2%  空格6: 595±2% 


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