AIPMT PRELIMS2002Physics-Waves
AIPMT PRELIMS 2002 Physics Doppler Effect MCQ Question
Type: MCQ-numerical-Hard-Class 11
A whistle revolves in a circle with angular speed ω = 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 :- (V_sound = 340 m/s)
A
385 Hz
B
374 Hz
C
394 Hz
D
333 Hz
Correct Answer
Option B
Detailed Explanation
Using the Doppler effect for circular motion, the minimum frequency is f' = f(v - v₀)/(v + v₀), where v₀ = rω. Substituting values gives 333 Hz.
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