A car sounding its horn at 480 Hz moves towards a high wall at a speed of 20 m/s, the frequency of the reflected sound heard by the man sitting in the car will be nearest to :

A car sounding its horn at 480 Hz moves towards a high wall at a speed

1.	A car sounding its horn at 480 Hz moves towards a high wall at a speed of 20 m/s, the frequency of the reflected sound heard by the man sitting in the car will be nearest to :
Answer» 510 HZ 570 Hz 480 Hz 540 Hz Solution :After reflection from the wall, the SOUND moves towards OBSERVER in the car. `v'=(v+v_(0))/(v-v_(s))xx v=(340+20)/(340-20) xx480` `=540 Hz`