MHT CET Physics question
An engine sounding a whistle of frequency 1152 Hz is receding from a stationary observer at 72 km/hour. If velocity of sound in air is 340 m/s, then the frequency of note heard by the observer is [MHT-CET 2016]
Answer: (D)
Solution
km/h m/s and Hz; 1224 Hz is higher than the true frequency
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