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# lab07 - The Physics of Light Sound LAB 07 SPEED OF SOUND...

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The Physics of Light & Sound Introduction Compared to most objects, sound waves travel very fast. It is fast enough that measuring the speed of sound is a technical challenge. One method you could use would be to time an echo. For example, if you were in an open field with a large building a quarter of a kilometer away, you could start a stop watch when a loud noise was made and stop it when you heard the echo. You could then calculate the speed of sound. To use the same technique over short distances, you need a faster timing system, such as a computer. In this experiment you will use this technique with a Microphone connected to a computer to determine the speed of sound at room temperature. The Microphone will be placed next to the opening of a hollow tube. When you make a sound by snapping your fingers next to the opening, the computer will begin collecting data. After the sound reflects off the opposite end of the tube, a graph will be displayed showing the initial sound and the echo. You will then be able to determine the round trip time and calculate the speed of sound. In this experiment the student will measure how long it takes sound to travel down and back in a long tube, determine the speed of sound and compare the measures speed of sound in air to the accepted value: v = 331+ 0.6 T (1) where: T is in degrees Celsius and v is in m/s. Equipment/Materials: Dell computer tube, 1-2 meters long LabPro and LoggerPro Vernier ULI Microphone meter stick Experimental Procedure Connect the Vernier Microphone to LabPro.

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