A train approaching a crossing at a speed of 100 km/h sounds a whistle `400 Hz` when it is
Channel: Doubtnut
Date: 02/11/2021

A train approaching a crossing at a speed of 100 km/h sounds a whistle `400 Hz` when it is 1.5 km from the crossing. There is no wind and the speed of sound in air is 340 m/s. What frequency is heard by an observer 1.0 km on the strainght road from the crossing at right angles.