Speed+of+Sound

=SPEED OF SOUND=

Equation: v = 331.4 + .6T where T is temperature in Celsius and the answer is in meters per second, but only for normal air. So, this would mean that when the temperature is 0, sound moves at 331.4 meters per second. Pretty slow compared to light ( 30,000 kilometers per second). In a room that is 72 degrees fahrenheit, speed would travel at about 344.5 meters per second. For ideal gases the equation is: v = √ Y R T / M Y is adiabatic constant, R is the gas constant, M is the molecular mass of the gas, and T is the absolute temperature.

Sound travels faster through water because the molecular weight is 18 compared to 28.95 for dry air.

Here is a video of Clayton and Jake making a vacuum so that the sound changes speed and becomes a lower and lower pitch until it is inaudible to the human ear. media type="file" key="Helium2.mov" width="300" height="300" This happens because as Jake sucks the air molecules out of the glass container, the speed of the molecules bouncing into one another stays the same, but they are further apart, so the frequency becomes lower, thence the pitch.

For how helium has to do with this topic, click here.

One thing to remember is that sound does NOT actually move. Sound is just waves creating vibrations through a medium (air) i.e. the air molecules are bouncing against each other because the vibrations of the sound are moving them.

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