Sound Propagation

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Sound Propagation

• By Paula Quintero, Rudy Jurado, and Anh-Quoc
  Nguyen
• Independence High School

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What are the issues with Sound?

• The propagation is one of the issues that we
  worked with. Propagation is is when sound travels
  through a medium as its intensity diminishes with
  distance
• The Attenuation is generally proportional to the
  square of sound frequency. It is the combined
  effect of scattering and absorption.

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Purpose

• The purpose of our experiment was to find if
  there are any differences with in the sound
  frequency as it travels horizontal versus
  vertically.

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Procedure

• We used the same recorder
• The same car was used throughout the experiment
• Approximately the same temperature during the
  trials

• The sound frequency analyzer we used was from
  Reliable Software
• We got sound samples at different distances
  horizontally as well as vertically

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Results
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Ground test
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Analysis

• According to our graph results we concluded that
  sound frequency tends to decrease at a more rapid
  rate going vertically rather than the decreasing
  in sound horizontally
• This result is for a high frequency of 2,900 Hz

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Conclusion

• We were expecting the sound to remain the same
  throughout the distances
• Because of the air pressure that is in the sky
  and other factors like the wind, and the fact
  that temperature changes as the balloon rises our
  results were different. It was clear that the
  frequency changes drops faster at a constant rate
  rather than it does horizontally.