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Under what conditions there will be no D...

Under what conditions there will be no Doppler effect or no change in frequency despite the motion of source and/or observer.

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Under following conditions no Doppler effect is observed.
(a)If one is at the centre of a circle and the other is moving on it. In this situation component of Vs along the line of sight is zero
(b)If source and observer both move in same direction with same speed i.e. if
`V_s=V_o=u` (say) , `eta.=eta{(V-u)/(V-u)}=eta`
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