sound

original link below

Extra Notes

2 3 8 9 14 18 Pg 511 2 3 4 7 (30 min)

Why does filling a tube create a noise that seems to increase in pitch??

-When the water hits the bottom a noise is created

that is made up of many wavelengths

-The wavelength that is 4 times longer than the depth

will resonate (because 1^st resonance length is wavelength/4)

-Therefore the pitch that corresponds to this wavelength will be

louder than the other pitches that make up the noise.

-As the tube fills the depth decreases, so shorter and shorter wavelengths

that make up the noise will resonate causing an overall pitch increase.

(Note what happens to air cavity inside your mouth when you whistle up the scales. Tongue moves up and reduces the size of the air cavity)