A train is traveling at 30.0m/m relative to the ground in still air. The frequen

Question

A train is traveling at 30.0m/m relative to the ground in still air. The frequency of the note emitted by the train whistle is 262Hz . The speed of sound in air should be taken as 344m/s . What freaquency fapproach is heard by a passenger on a train moving at a speed of 18.0m/s relative to the ground in a direction opposite to the first train and approaching it? What frequency frecede is heard by a passenger on a train moving at a speed of 18.0m/s relative to the ground in a direction opposite to the first train and receding from it?

Explanation / Answer

a) f = (v + vr)/(v+vs) f0 f= (344+18)/(344-30) 262=302 Hz b) (344-18)/(344+30) 262=228 Hz

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