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A 450 Hz source moves at 34 m/s towards a still listener. Sound speed is 340 m/s. What frequency is heard?
A400 Hz
B450 Hz
C550 Hz
D500 Hz
Answer & Solution
Correct answer: D. 500 Hz
f = 450 x 340 / (340 - 34) = 450 x 340 / 306 = 500 Hz for a source approaching a stationary listener.
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