Moreover, if sound of "being a can with a clang" of a crossing is heard out of a train, isn't there any experience thought that how to be heard in the time of keeping away with the time of approaching a crossing is different?
These are the phenomena which physicist Doppler of Austria discovered in the mid-1800s and which are called the "Doppler effect."
It is said that the old person conducted the experiment using a drum and fife corps in order to confirm the Doppler effect of this sound.
It actually verified about the case where assign a drum and fife corps in a station, it is made to play, a watcher takes a train, and sound is observed, and the case (when a sound source moves and the watcher is standing it still) where put on the train which runs a drum and fife corps, it is made to perform (when a watcher moves and the sound source is standing it still), and a watcher observes sound at a station.
About the case where a watcher moves and a sound source stands it still, verification will be possible even now (if lucky) ., for example, the person "high speed may ride on high speed and may pass through the station which does not stop although a local train draws up", has a chance -- there is a place where the signal at the time of leaving now is using what is called not bell sound but a melody.
If it passes through the station with a rapid train (while the melody of the highball is sounding), and . which the melody becomes amusing and hears it by the Doppler effect will also be carried out and it will meet with such a situation just before another train leaves a station, please strain and listen to an ear.
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