Maktab. pk
This video lecture from Waves (F.Sc. first year physics) This video explains the Doppler,s effect and one of its cases and you will learn that what will happen when obsever is moving away the stationary source , then their is change in the speed but the wavelength remains constant. Find more e-learning material and educational video lectures in Urdu at maktab.pk. These videos are free to use for promotional and commercial purpose by keeping the credits to Maktab.
Source
FSc Physics Book1, CH 8, LEC 16: When an Observer is Moving Away
