gc textbook chapter 12 Sound (id: 83082e4aa)

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 certain dog whistle operates at 23.5 kHzxwt mw8.s7;sx c4-o yejmo1z2-z:u ay, while anot2w jhtr4o f1x+90dg.xio 5rqxher (brand X) operates at an unknown frequency. If neither whistle can be heard by humans when played separately, but a shrill whine of frequency 5000 Hz occurs when they are played simultaneously, estimate the operating frequency of brand r+t 0ojrq4xd5 g.hi o2wx9 x1fX.    kHz

参考答案: 28.5±2%


本题详细解析:

微信扫一扫，分享更方便