A locomotive approaching a crossing at a speed of 20m/s aound a whistle of frequency 640Hz when 1 km from - Physics - Waves

Question

A locomotive approaching a crossing at a speed of 20m/s aound a
whistle of frequency 640Hz when 1 km from crossing There ia no wind
and the speed oof aound of air is 330m/s What frequency is heard by
an observer 3 under root km on the straight road from crossing at
right angle Ans is 660 hz

Govind · Accepted Answer

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A locomotive approaching a crossing at a speed of 20m/s aound a whistle of frequency 640Hz when 1 km from crossing. There ia no wind and the speed oof aound of air is 330m/s. What frequency is heard by an observer 3 under root km on the straight road from crossing at right angle. Ans is 660 hz.