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 : (speed of sound in air is 330 m/s) :
(1) 5000 Hz
(2) 3000 Hz
(3) 3500 Hz
(4) 4000 Hz
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