JEE Main & Advanced
JEE Main Paper (Held On 10 April 2016)
question_answer
A toy-car, blowing its horn, is moving with a steady speed of 5 m/s, away from a wall. An observer, towards whom the toy car is moving, is able to hear 5 beat per second. If the velocity of sound in air is340 m/s, the frequency of horn of the toy car is close to:
JEE Main Online Paper (Held On 10 April 2016)