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\sadallday said:please explain for me doppler effect
neils_arm_strong said:I think electronics_kumar needs to study physics again.
Doppler effect refers to the virtual change in the wavelength of a sound/light wave being emitted from a moving object.Base on the change in wavelength,the velocity of the moving object can be estimated.Velocities of stars have ben found this way.
Refer: Fundamentals of Physics-Resnick,Halliday,Krane.