Give two cases in which there is no Doppler effect in sound?

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The following are the two cases in which there is no Doppler effect in sound (i.e no change in frequency):- 

1) When the source of sound as well as the listener moves in the same direction with the same speed. 

2) When one of source | listener is at the centre of the circle and the other is moving on the circle with uniform speed. 

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