Questions
A speeding motorcyclist sees traffic jam ahead 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, the frequency of the honk as heard by him will be
detailed solution
Correct option is C
Here speed of Motorcyclist speed isvm=36 km hour -1=36×518 m s-1=10 m s-1Speed of car,vc=18 km hour -1=18×518 m s-1=5 m s-1Frequency of source, ν0= 1392 HzSpeed of sound, ν=343 m s-1The frequency of the honk heard by the motorcyclist isv'=v0v+vmv+vc=1392343+10343+5=1392×353348=1412 HzSimilar Questions
A band playing music at a frequency n is moving towards a wall at a speed vb . A motorist is following the band with a speed v m,-. If v is the speed of sound, the expression for the beat frequency heard by the motorist is
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