gc textbook chapter 12 Sound (id: e09a88d30)

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 source emits sound of wavelengths 2.64 m ad(*k x( hxo6vvndxqc yk:a+6r1tef v8e4 2.76 m in air. How many beats per second will be heard? (Assveer xc 41a 68fy:t+qkume T = 20 $^{\circ} $C)$\approx$    Hz(round to one decimal place)

参考答案: 5.6±2%


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