An observer standing by the side of a road hears the siren of an ambul – McqOptions

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1.	An observer standing by the side of a road hears the siren of an ambulance, which is moving away from him. If the actual frequency of the siren is 2000Hz, then the frequency heard by the observer will be
A.	1990Hz
B.	2000Hz
C.	2100Hz
D.	4000Hz
Answer» B. 2000Hz

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