A train moving at a speed of 220ms^-1 to...

A train moving at a speed of `220ms^-1` 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 `330ms^(-1)`)

3500 Hz

4000 Hz

5000 Hz

3000 Hz

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