A speeding motorcyclist sees traffic jam ahead him. He slows down to $$36$$ km hour $$-1$$. He finds that traffic has eased and a car moving ahead of him at $$18$$ km hour $$-1$$ is honking at a frequency of $$1392$$ Hz. If the speed of sound is $$343$$ $$ms-1$$, the frequency of the honk as heard by him will be

Question

A speeding motorcyclist sees traffic jam ahead him. He slows down to $$36$$ km hour $$-1$$. He finds that traffic has eased and a car moving ahead of him at $$18$$ km hour $$-1$$ is honking at a frequency of $$1392$$ Hz. If the speed of sound is $$343$$ $$ms-1$$, the frequency of the honk as heard by him will be

Infinity Learn · Accepted Answer

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, ν$$0=$$ $$1392$$ HzSpeed of sound, ν$$=343$$ m $$s-1The$$ frequency of the honk heard by  the motorcyclist isv'$$=v0v+vmv+vc=1392343+10343+5=1392$$×$$353348=1412$$ Hz

Q.

Unlock the Full Solution and Master the Concept