NEET 2002 Physics question
A whistle revolves in a circle with angular speed = 20 rad/sec using a string of length 50 cm. If the frequency of sound from the whistle is 385 Hz, then what is the minimum frequency heard by an observer which is far away from the centre : - ( = 340 m/s)
Answer: (2)
Solution
Speed of the whistle . The observer is far away at rest. The frequency is minimum when the whistle moves away from the observer (Doppler effect): $ = =
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