A train is traveling at 30.0m/m relative to the ground in still air. The frequen
ID: 1909116 • Letter: A
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