NEET 2014 Physics question
A speeding motorcyclist sees traffic jam ahead of him. He slows down to 36 km/hour. He finds that traffic has eased and a car moving ahead of him at 18 km/hour is honking at a frequency of 1392 Hz. If the speed of sound is 343 m/s, the frequency of the honk as heard by him will be
Answer: (3)
Solution
Observer (motorcyclist) speed , source (car) speed , both moving in the same direction with the observer behind the source, so the observer approaches the source faster than the source recedes. $f' =
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