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