多普勒效应
多普勒效应是波源搭观察者有相对运动时，观察者接受到波个频率搭波源发出个频率并弗相同个现象。远方急驶过来个火车鸣笛声变得尖细（即频率变高，波长变短），而离我伲而去个火车鸣笛声变得低沉（即频率变低，波长变长），迭个就是多普勒效应个现象。
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