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笔者在讲授多普勒效应时,学生就一个问题发生了争论,问题如下:观察者不动,声源加速远离观察者而去,则观察者听到的声音的频率将如何变化?一部分学生认为听到的声音频率变低.另一部分学生认为听到的声音频率越来越低.究竟哪个结论正确,下面进行分析.由于声源与观察者间的距离变
When the author was teaching the Doppler effect, the students had a dispute on a problem. The question was as follows: When the observer does not move and the sound source accelerates away from the observer, how often does the frequency of the sound heard by the observer change? Some students think that The frequency of the heard sounds becomes lower. The other students think that the frequency of the sound heard is getting lower and lower. Which of the conclusions is correct is analysed below. The distance between the sound source and the observer changes.