Hanna Rhoads
7a Science
5/23/12
Hypothesis: The best materials will be hollow for the sound to amplify the best.
Variable: Amplifier
Materials:
Procedure:
Data Table and Analysis:
Decibels Recorded From Each Material
Analysis: My hypothesis was correct, hollow objects were better for amplifying the sound.The box made to amplify the sound was the best, that makes sense because it was made for that purpose, but the soup can worked pretty well too. The table was better possibly because there was empty space under it, and the whiteboard had a solid wall behind it, which would absorb and muffle the sound waves.
Conclusion: The sound level in the room may have affected how the decibel meter worked, but because we tested it several times and results were similar I think the data is accurate for the purpose of this lab. It may have been better to do it in the halls where it was quieter though. Sound travels through different things it is interesting how some amplify it and some muffle it. So based on this I conclude that different materials conduct sound differently like heat and electricity are conducted. I wonder what other forms of energy behave like this.
Further Inquiry: I would like to see if doing this lab in a quieter room, with more materials would leave our results intact and show if my hypothesis is correct. Which materials conduct sound the best, what would work better than the box intended to amplify the tuning forks.
7a Science
5/23/12
Tuning Fork and Different Amplifiers
Guiding Question: Does the Material Used to Amplify a Tuning Fork Influence the Amount of Sound Made?Hypothesis: The best materials will be hollow for the sound to amplify the best.
Variable: Amplifier
Materials:
- tuning fork (G note)
- notebook
- pencil or something to write with
- decibel meter
- desk
- soup can
- box intended to amplify tuning fork
- whiteboard
Procedure:
- Get the materials ready - lay them out.
- Take the tuning fork, and strike it against something.
- Press it against one of the objects laid out.
- While holding it there, check the decibel meter and record the information.
- Repeat with the same object, to record accurately - if they are completely different, record again.
- Move on to the next object, recording every strike.
Data Table and Analysis:
Decibels Recorded From Each Material
| Material | Trial | Average Decibels | Peak Decibels |
| box (hollow) | 1 | 52 | 78 |
| box (hollow) | 2 | 52 | 87 |
| whiteboard (solid) | 1 | 46 | 62 |
| whiteboard (solid) | 2 | 51 | 63 |
| soup can (hollow) | 1 | 50 | 87 |
| soup can (hollow) | 2 | 50 | 74 |
| desk (solid) | 1 | 47 | 59 |
| desk (solid) | 2 | 49 | 69 |
Analysis: My hypothesis was correct, hollow objects were better for amplifying the sound.The box made to amplify the sound was the best, that makes sense because it was made for that purpose, but the soup can worked pretty well too. The table was better possibly because there was empty space under it, and the whiteboard had a solid wall behind it, which would absorb and muffle the sound waves.
Conclusion: The sound level in the room may have affected how the decibel meter worked, but because we tested it several times and results were similar I think the data is accurate for the purpose of this lab. It may have been better to do it in the halls where it was quieter though. Sound travels through different things it is interesting how some amplify it and some muffle it. So based on this I conclude that different materials conduct sound differently like heat and electricity are conducted. I wonder what other forms of energy behave like this.
Further Inquiry: I would like to see if doing this lab in a quieter room, with more materials would leave our results intact and show if my hypothesis is correct. Which materials conduct sound the best, what would work better than the box intended to amplify the tuning forks.
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