19 A locomotive approaching a crossing at a speed of 20 ms

Last updated: 6/14/2023

19 A locomotive approaching a crossing at a speed of 20 ms sounds a whistle of frequency 640 Hz when 1 km from the crossing There is no wind and the speed of sound in air is 330 ms What frequency is heard by an observer 3 km on the straight road from the crossing at right angle 1 600 Hz 3 660 Hz Sound Observer 3 km 20 ma Crossing Motion of Locomotive 2 630 Hz 4 720 Hz