A racing car moving towards a cliff sounds its horn. The driver observes that the sound reflected from the cliff has a pitch one octave higher than the actual sound of the horn. If v be the velocity of sound, the velocity of the car u is

Question

Infinity Learn · Accepted Answer

Frequency received by driver after reflection from wall is given by n′≡$$nv+uv$$−u where $$=$$ velocity of car moving towards wall If the car is moving away from wall, then n′′$$=nv$$−$$uv+u$$ Given that n $$=2$$ n Here, octave means double to original hequency $$nv+uv$$−$$u=2n$$ or $$v+u=2v$$−$$2u$$  or  $$u=v/3$$

A racing car moving towards a cliff sounds its horn. The driver observes that the sound reflected from the cliff has a pitch one octave higher than the actual sound of the horn. If v be the velocity of sound, the velocity of the car u is

Remember concepts with our Masterclasses.

Ready to Test Your Skills?

free study material