The call to learn | Clifford Stoll

延伸阅读 1

Clifford Stoll 用振荡信号和移动麦克风测声速。频率可以从计数器读出，波长要从相同相位再现的距离估计。这给波速公式里的每个量对应了一项操作。

视频与逐字稿来源 ↗ · 引文按字幕原文展示，可点时间戳回看片段。

补充字幕原文 2

was that if you multiply the frequency times the wavelength of sound or light, you get a constant. And that constant is the speed of sound.

It's 1.76 kilohertz. I measure its wavelength.