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Can You Hear Me Now? (page 3)

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Author: Andrew S.

Conclusions

The original hypothesis states that at 450°F and at 197 cm, more sound would be collected because sound travels faster in higher pressure. Also, if there is more heat in the air, the higher pressure. The hypothesis was partially correct. At 225°F and at 197 cm, the average sound collected was 1826.2 Hz, and at 450°F and at 197 cm the average sound collected was 4643 Hz. However, at 425°F and at 197 cm, the average sound collected was 4805.6 Hz. All of the averages trials at 394 cm were lower than the ones at 197 cm, the highest being 2887.6 Hz at 450°F. The closer an abject is and the more heat is present allows it to collect more sound. 

Questions for Further Research

Fairness of the Experiment

Not all of the other factors besides the independent variable were controlled. First, the thermostat doesn’t read the temperature in the whole house, so the temperature could have been different then what the thermostat read. Also, the dish could have moved a little from all of the handling it had during the experiment. Third, since the tuner metronome couldn’t be placed in the oven when it heated up, the metronome was in different places in the oven all of the time. If the experiment could have been repeated, a room that could be heated up evenly would have been used. Also, a heat resistant metronome would have been ideal with the parabolic sound collecting dish bolted down. Lastly the container should be sound proof and have the air pressure at sea level.

Other Areas of Interest
  1. How does changing the temperature to negative degrees effect sound collection?

            This relates to our experiment because it has to do with how temperature affects the amount of sound collected. If hotter temperatures make the amount of sound collected go up, then cooler temperatures should make the amount collected go down. It would be interesting to see if this is true.

  1. How does changing the amount of wind affect the rate of sound collection?  

            This relates to our experiment because the experiment took place in a windless environment. However, the wind outside is always changing, due to differences in air pressure, so the amount of hertz collected might depend on the wind.

  1. How does changing the volume (decibels) of the sound effect sound collection?

Decibels and Hertz are related in the sense that they both have to do with sound. Saying this, the amount of decibels given off could affect the amount of Hertz collected.

Bibliography

Websites

Jason, and Samuel. Sound Is Energy. Web. 15 Dec. 2010. <http://library.thinkquest.org/5116/sound.htm>.

Davidson,, By Michael. "The Effects of Low Barometric Pressure on the Ears | EHow.com."EHow | How To Do Just About Everything! | How To Videos & Articles. Web. 15 Dec. 2010. <http://www.ehow.com/list_6011957_effects-low-barometric-pressure-ears.html>.

Weed,, By Geoffrey. "What Is Barometric Pressure? | EHow.com." EHow | How To Do Just About Everything! | How To Videos & Articles. Web. 16 Dec. 2010. <http://www.ehow.com/about_4597603_what-barometric-pressure.html>.

"Speed of Sound." Test Page for Apache Installation. Web. 15 Dec. 2010. <http://hyperphysics.phy-astr.gsu.edu/hbase/sound/souspe2.html>.

"Sound." Encyclopædia Britannica. 2010. Encyclopædia Britannica Online. 15 Dec. 2010 <http://www.britannica.com/EBchecked/topic/555255/sound>.

"Sound." Encyclopædia Britannica. Encyclopædia Britannica Online School Edition. Encyclopædia Britannica, 2010. Web. 15  Dec.  2010. <http://school.eb.com/eb/article-9109557>.

Adnes, Michael. "Sound Waves." Websters Dictionary. Print.

Books

Vecchione, Glen. "Parabolic Sound-Collecting Dish." 100 Amazing Make-it-yourself Science Fair Projects. New York: Sterling Pub., 2005. 71-75. Print.

Busch-vishniac, Ilene J. "World Book Inc - Books from This Publisher (ISBNs Begin with 978-0-7166)." Books by ISBN - Search Books by ISBN. 2008. Web. 15 Dec. 2010. <http://www.books-by-isbn.com/0-7166/>.

The World Book Encyclopedia. Chicago: World Book, 2000. 217+. Print.

Adnes, Michael. "Sound Waves." Websters Dictionary. Print.

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