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Sahay Sir > Question Answers > MTG NEET Physics > Part 1 > Chapter 17 - Wave Motion > A train approaching a railway crossing at a speed of 120kmh^−1 sounds a short whistle at frequency 640 Hz when it is 300 m away from the crossing. The speed of sound in air is 340ms^−1. What will be the frequency heard by a person standing on a road perpendicular to the track through the crossing at a distance of 400 m from the crossing ?

A train approaching a railway crossing at a speed of 120kmh^−1 sounds a short whistle at frequency 640 Hz when it is 300 m away from the crossing. The speed of sound in air is 340ms^−1. What will be the frequency heard by a person standing on a road perpendicular to the track through the crossing at a distance of 400 m from the crossing ?

A car moving with velocity 50 m s towards a wall sounds a horn of frequency of 1.2 kHz. The velocity of sound is 350 m/s the apparent frequency of the echo heard by the driver is