一种以多种方式使用的发现是多普勒效应，尽管乍一看科学发现似乎相当不切实际。 多普勒效应完全是关于波浪，产生这些波的东西（源），以及接收这些波的东西（观察者）。 它基本上说如果源和观察者相对于彼此移动，那么它们中的两个波的频率将是不同的。 这意味着它是一种科学相对论。 实际上，这个想法已经被用于实际结果的两个主要领域，并且最终都得到了“多普勒雷达”的处理。 从技术上讲，多普勒雷达是警察“雷达枪”用来确定机动车速度的方法。 另一种形式是脉冲多普勒雷达，用于跟踪天气降雨的速度，通常，人们知道在天气报告期间使用的术语。
One discovery that is used in a variety of ways is the Doppler effect, even though at first glance the scientific discovery would seem to be rather impractical. The Doppler effect is all about waves, the things that produce those waves (sources), and the things that receive those waves (observers). It basically says that if the source and observer are moving relative to each other, then the frequency of the wave will be different for the two of them. This means that it’s a form of scientific relativity. There are actually two main areas where this idea has been leveraged into a practical outcome, and both have ended up with the handle of “Doppler radar.” Technically, Doppler radar is what is used by police officer “radar guns” to determine the speed of a motor vehicle. Another form is the Pulse-Doppler radar which is used to track the speed of weather precipitation, and usually, people know the term from it being used in this context during weather reports.