State in which of the following cases, an observer will not see any Do

1.	State in which of the following cases, an observer will not see any Doppler effect ?
Answer» Both the SOURCE and abserver remain stationary but a wind BLOWS . The observer REMAINS stationary but the source moves in the same directrion and with the same speed as the wind The source remains stationary but the observer and the wind have the same speed AWAY the sourch . The source and the observer move directly against the windbut both with the same speed . Solution :N/A

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