the high pitched sound which I'm guessing is the whirring sound from the engine's turbocharger/supercharger. the sound comes when the impeller blades of the TC/SC rotates at very high velocity.... it's very similar to the sound of a jet engine but only on a small scale.
sound is wavelengths, and wavelengths get compressed when coming to you (and stretched when going away). the closer the wavelengths, the higher the pitch!
What cause a whistle song on my gmc jimmy
A whistle is a High Pitch because its really loud and not really low.
The train's whistle can change in pitch over time.
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
The raising and lowering of the whistle's pitch due to the alteration in the relative speed of the whistle as it goes by you, described by two terms that can be discovered by reading your homework assignment.
it has a less of a room to vibrate so you get a high pitch, and when you have more of a room to vibrate, then you get a lower pitch!
the pitch doesnt actually change but it might sound quieter to you because the sound it being blown away
This is known as the Doppler effect. As the train approaches you, the wavelength of the sound waves it emits are compressed, and therefore the whistle sounds higher. When the train is moving away, the wavelengths are extended, causing the whistle to sound lower. If the train were not moving at all, the pitch you would hear from the whistle would be somewhere between the high and low pitches you hear when the train is moving.