# Two passenger trains moving with a speed of 108 km/hour cross each other. One of them blows a whistle whose frequency is 1500 Hz. If sound speed is 330 m/s, then passengers sitting in the other train, after trains cross each other will hear sound whose frequency will be Option 1) 1250 Hz Option 2) 625 Hz Option 3) 1500 Hz Option 4) 900 Hz

As we learnt in

Frequency of sound when source & observer are moving away from each other -

- wherein

Speed of sound

Speed of observer

speed of source

Original frequency

apparent frequency

Here both are moving away from each other

Option 1)

1250 Hz

This option is correct.

Option 2)

625 Hz

This option is incorrect.

Option 3)

1500 Hz

This option is incorrect.

Option 4)

900 Hz

This option is incorrect.

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