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2. Experiment Basics Purpose To test if a change in altitude,which causes a change in air density, affects sound intensity Hypotheses A1: The sound intensity is directly proportional to altitude A2: The sound intensity is affected by the altitude, but it is not directly proportional to the altitude B: Sound intensity does not vary at altitude

3. Equipment Lab-Pro Microphone 9 Volt Battery Buzzer WDSS

4. Procedure Set up sensors and buzzer Attach gondola to balloon Raise gondola 100ft. and hold position for 1 minute Continue raising and pausing until 900 ft. is reached Bring down balloon Retrieve data Repeat as necessary to collect accurate data

5. Intensity vs. Time

6. Analysis The level of decibels at altitude decreased averages 77.49dB Ground level 47.54dB 100ft. 42.68dB 200ft. 41.33dB 300ft. 43.59dB 400ft. 39.32dB 500ft. 39.33dB 600ft. 38.1dB 700ft. 38.91dB 800ft. 39.17dB 900ft. 44.75 -average over total flight 41.10 -average without ground level average

7. Obstacles To Overcome Start constructing experiment earlier Consider other variables –Ambient noise

8. Conclusion Because our margin of uncertainty was so high, and our data was so varied, we can neither confirm nor disprove our hypothesis.

9. Lesson Learned There are many variables to consider when measuring sound –Ambient noise –Sensitivity of microphone Sound-proofing a box is more difficult than we anticipated To attain results, all measuring equipment must be properly initiated!