the Doppler effect

noun

🔊/ðə ˈdɒplər ɪfekt/

🔊/ðə ˈdɑːplər ɪfekt/

[singular] (physics物理)

jump to other results

the way that sound waves, light waves, etc. change in frequency depending on the direction that the source is moving in relative to the person who is observing多普勒效应（即声波、光波等按声源、光源等相对于观察者的传播方向的变化而变化）