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sound is wavelengths, and wavelengths get compressed when coming to you (and stretched when going away). the closer the wavelengths, the higher the pitch!
The train's whistle can change in pitch over time.
but crack
whistle
A whistle is a High Pitch because its really loud and not really low.
the pitch doesnt actually change but it might sound quieter to you because the sound it being blown away
Since you are also on the moving train, the pitch should remain constant.
You do not even need your lips to whistle. They actually produce poorer quality pitches than if you don't use your lips. You use your tongue and arc it up/down to change the pitch of the whistle and push a tight hole of air through your teeth.
What cause a whistle song on my gmc jimmy
The sound a whistle makes is often described as "whoo" or "wee" depending on the pitch and intensity of the sound.
it depends on the length
A whistle makes a high sound because of the short length of the whistle's tube, which amplifies high-frequency sounds. When air is blown into the whistle and vibrates at a high frequency, it produces a high-pitched sound.