doppler effect
1
多普勒效应, 多普勒现象
the change in frequency or wavelength of a wave in relation to an observer who is moving relative to the source of the wave, producing a shift in pitch or color
- The Doppler effect explains why the pitch of an ambulance siren changes as it approaches and then passes by.
多普勒效应解释了为什么救护车警报器的音调在接近然后经过时会发生变化。
- When a car with a honking horn drives by, the change in pitch you hear is due to the Doppler effect.
当一辆鸣笛的汽车驶过时，你听到的音高变化是由于多普勒效应。
- In astronomy, the Doppler effect helps scientists determine the speed and direction of celestial objects.
在天文学中，多普勒效应帮助科学家确定天体的速度和方向。
- The color shift in the light from a moving star is an example of the Doppler effect in astrophysics.
来自移动恒星的光的颜色变化是天体物理学中多普勒效应的一个例子。
- The Doppler effect is employed in police radar guns to measure the speed of moving vehicles.
多普勒效应被用于警察雷达枪中，以测量移动车辆的速度。
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