A train moving at a speed of 220 m/s towards a stationary object , emits a sound of frequency 1000 Hz . Some of the sound reaching the object gets reflected back to the train as echo . The frequency of the echo as detected by the driver of the train is

A train moving at a speed of 220 m/s towards a stationary object , emi

1.	A train moving at a speed of 220 m/s towards a stationary object , emits a sound of frequency 1000 Hz . Some of the sound reaching the object gets reflected back to the train as echo . The frequency of the echo as detected by the driver of the train is
Answer» 3000 HZ 3500 Hz 4000 Hz 5000 Hz SOLUTION :`F. = ((330 + 220)/(330 + 220)) xx 1000 = 5000` Hz