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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!
whistle
A whistle is a High Pitch because its really loud and not really low.
The train's whistle can change in pitch over time.
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
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!
but crack
the pitch doesnt actually change but it might sound quieter to you because the sound it being blown away
The pitch is determined by the frequency of the wave.The absolute loudness is determined by the wave's amplitude.The loudness perceived by the ear is affected by both the above, because the sensitivity of the ear is frequency dependent.