How+Sound+Changes


 * How Sound Changes:**

There are many different variables that effect sound and sound waves changing their velocity, frequency, and structure. These variables include, but are not limited to: air temperature, open or closed tubes, length, and tension.


 * The change of ****air temperature** ** will change sound. Temperature affects the strength of air particle in the air. The lower the temperature, the easier it is for the sound to travel through the air. 

If the tube is Open or Closed** will change sound. If the tube is closed the wavelength starts at a node where the closed end is and ends at antinode. If the tube is open the wavelength begins and ends on an antinode. Depending on where the Node or Antinode is in the tube, the wavelength of the wave changes thus changing the frequency or velocity of that particular sound.

The easiest way to change sound is to change the length of the object making the sound. If the **Length** of the tube is changed it will change sound. Example: Instruments like a flute The flute has holes along the tube to shorten or lengthen the length of the tube to create a different sound. All instruments have different sounds and pitches. Each brass instrument has a different construction of their tubes which results in a different sound. A great example of this is when a french horn plays a C and a flute plays the same C but the sound is different, this is because of how the instruments are constructed.

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 * Tension** also changes sound. The greater the tension the greater the velocity of the sound waves. If the velocity is increased and the frequency is kept constant then the wavelength increases. The opposite is also true.