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SoundSoundSoundSound (id: 83bf0959d)

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admin 发表于 4 天前 | 显示全部楼层 |阅读模式
本题目来源于试卷: SoundSoundSoundSound,类别为 IB物理学

[填空题]
Two automobiles are equipped wid:3o l/wemzu0 n.4y arth the same single frequency horn. When onelida+9,)k*eypf8 zn;es cwn 2gm/0 k e is at rest and the e)2;skc/em+ nnwla ie8 *kg p9z,0fy dother is moving toward the first at 15 m/s the driver at rest hears a beat frequency of 5.5 Hz. What is the frequency the horns emit? Assume T = 20 $^{\circ} $C    Hz




参考答案: 120±2%


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