So if now I hang on it a mass of one kilogram, I can calculate the period of one oscillation, and one over the period F is the frequency F, and I believe that is something like 38 hertz.

如果在上面,悬挂1公斤物质，我能够计算出,振荡的周期，1除以周期,等于频率，我相信,等于大概38赫兹。

youdao

So you can see now if the object comes to you, in other words, f if f prime is larger than f, if the frequency is higher, then the wavelength will be smaller.

所以你可以看到,如果物体靠近你，换句话说，如果f撇大于，如果频率变高，波长就会变短。

youdao

Let this be the transmitter f which produces frequency f, and here is the receiver which receives the frequency f prime.

这个是发射机,发射频率是，这是接收机,接收频率f撇。

youdao