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Question

A siren is fixed at the centre of a circle and an observer is performing a uniform circular motion around the siren with constant radius. The apparent frequency heard by the observer will be


Correct Answer
A
same as the actual frequency of siren.
Your Answer
B
more than the actual frequency of siren.
Your Answer
C
less than the actual frequency of siren.
Your Answer
D
sometime more and sometime less than the actual frequency of siren.

Solution

The correct option is A same as the actual frequency of siren.
While moving on a circular path around the source, the velocity of the observer will always be perpendicular to that of the source i.e it is neither approaching nor receding from the source. Therefore observer will hear same frequency as source is emitting.

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