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Doppler effect: The wavelength of radiation changes due to the relative movement of the light source and the observer. In front of the moving wave source, the wave is compressed, the wavelength becomes shorter, and the frequency becomes higher (blue shift). Behind the moving wave source, the opposite effect occurs. The wavelength becomes longer and the frequency becomes lower (red shift). The higher the velocity of the wave source, the greater the effect.
Doppler effect: The wavelength of radiation changes due to the relative movement of the light source and the observer. In front of the moving wave source, the wave is compressed, the wavelength becomes shorter, and the frequency becomes higher (blue shift). Behind the moving wave source, the opposite effect occurs. The wavelength becomes longer and the frequency becomes lower (red shift). The higher the velocity of the wave source, the greater the effect.