Sunday 28 September 2014
Can You Hear Me Now
Abstract
The objective: I want to determine the relationship between air pressure and sound. I hypothesize that as the air pressure decreases, the sound will decrease at a
faster rate.
Methods/Materials
A ringing bell was placed inside a vacuum chamber, along with a digital sound level meter. For each test cycle, I increased the vacuum gauge 5 inches of mercury of
vacuum at a time, from 0 to 25. (This decreased the air pressure in the vacuum chamber.) I recorded the inches of mercury of vacuum and the corresponding decibel
number from the sound meter. After five tests, I reviewed and evaluated my data.
Results
For each of my tests, the decibels consistently decreased as the air pressure decreased. In particular, the decibels decreased in larger increments every time
there was an increase of 5 inches of mercury of vacuum.
Conclusions/Discussion
Based on my test data, I have reached the conclusion that the decibels and inches of mercury of vacuum have an inverse relationship. You can also say that sound
level decreases quickly with decreased air pressure. Either way, there is a logarithmic pattern. In other words, the decibels decrease at a rate that is exponential
and not linear.
This project is about identifying the relationship between air pressure and sound, by adjusting the air pressure in a vacuum chamber, while the sound remains
constant.
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