Wave Motion 4 Question 28
26. A whistle emitting a sound of frequency is tied to a string of length and rotated with an angular velocity of in the horizontal plane. Calculate the range of frequencies heard by an observer stationed at a large distance from the whistle. (Speed of sound ).
(1996, 3M)
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Answer:
Correct Answer: 26. (b, c)
Solution:
Speed of source (whistle)
Maximum frequency will be heard by the observer in position
where,
and
Therefore, range of frequencies heard by observer is from