How+Sound+Travels

Sound travels in waves:
The waves are longitudinal meaning they move parallel to the medium. Compressions is a region of high molecular density and high air pressure (the waves is compressed), where a rarefaction is a region of low molecular density and low air pressure (the wave is stretched out).

Speed of Sound:
v=λf--> Where velocity equals wavelength times frequency. General Form--> v=√(elastic property/inertial property) In a liquid--> v=√(B/p) where B is the bulk modulus of the liquid and p is the equilibrium density. In a string--> v= √(Ft/µ) where Ft is the force of Tension on the string and µ is linear density. In air--> 330.6+((.6m/s)/C)T where .6(m/s)C is a constant and T is temperature in Celsius In a solid rod--> v=√(Y/p) where Y is the Young's modulus of the solid, defined as the longitudinal stress divided by the longitudinal strain, and p is the density of the solid.

Sound is mechanical which means it needs a medium because sound is not electromagnetic.

SOUND NEEDS A MEDIUM!!!! media type="file" key="Sound Project.mov" width="300" height="300" As the video shows, if the medium is taken away the sound is no longer heard. The vacuum takes the air out of the jar, leaving no medium for the sound to travel in. once the air is let back into the jar, the sound can be heard again.