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26 Nov 2019
A man is riding a train moving at 135 mi/h, which is one-fifth thespeed of sound.
As he approaches his friend who is standing by the tracks, he blowshis trumpet with
a frequency f.
1. What frequency does his friend hear?
On the return trip, the manâs friend, still standing by the track,blows her trumpet
with frequency f.
2. What frequency does the man in the train hear?
3. Why are your answers to parts (1)and (2) different-doesnât eachperson see the
other approach at 135 mi/h?
A man is riding a train moving at 135 mi/h, which is one-fifth thespeed of sound.
As he approaches his friend who is standing by the tracks, he blowshis trumpet with
a frequency f.
1. What frequency does his friend hear?
On the return trip, the manâs friend, still standing by the track,blows her trumpet
with frequency f.
2. What frequency does the man in the train hear?
3. Why are your answers to parts (1)and (2) different-doesnât eachperson see the
other approach at 135 mi/h?
