SoundSoundSoundSound (id: a37459a42)

本题目来源于试卷: SoundSoundSoundSound，类别为 IB物理学

[填空题]
A pipe in air at 20 sqmbf5ft g:i )x hp915 8h5edmo)2n2ht39tgcg 1dzb o$^{\circ} $ C is to be designed to produce two successive harmonics at 240 Hz and 280 Hz. How long must the pipe be, and is it open or closed?  ----待选择----closedopen  f =    m

参考答案:
空格1: open  空格2: 4.3±2% 


本题详细解析:

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