Doppler effect is a phenomenon in which the perceived frequency of a wave changes when there is relative motion between the source of the wave and the observer. This effect can be observed in many different types of waves, including sound waves, light waves, and electromagnetic waves.
In science, the Doppler effect is used to gather information about the motion and properties of objects in space. Astronomers use the Doppler effect to determine the speed and direction of objects in the universe, including stars and galaxies. By analyzing the shift in frequency of light emitted by these objects, scientists can calculate how fast they are moving relative to Earth.
The Doppler effect is also used in medical imaging, such as ultrasound. By analyzing the frequency shift of sound waves reflected off internal organs and tissues, doctors can create detailed images of the inside of the body.
In addition, the Doppler effect is used in remote sensing, including weather radar and speed cameras. By analyzing the frequency shift of electromagnetic waves, scientists and engineers can gather information about atmospheric conditions, as well as calculate the speed of moving objects.