Materials
- varying materials for sound to pass through
-sound meter (decibel meter phone app) - ruler - saw - scissors - tape |
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Procedure
1. First, the poster paper was wrapped around the circumference of the metal once without any air bubbles and was taped tight. Next, 20cm of extra height of poster paper was added for the metal to enable the sound source to be an equal distance from the top of each material. 2. The volume of the metal was measured and then replicated for the wood, foam, and clay. 3. Since the wool was not a solid object, the metal was used to measure the cylinder needed for the wool. The original height of the metal was measured and marked on the poster paper, then 20cm of height was added. 4. The cylinder was packed as tightly as possible with wool to the indicated mark. As with the other materials, there was 20cm of height left at the top of the cylinder. 5. A decibel meter (an app called Sound Meter found on the Apple App store) was used, and the intensity of a constant sound source (a consistent sound effect from a different phone) was measured three times. The results were recorded. 6. The constant sound source was placed above the cylinder of the metal and the decibel meter was placed directly under the insulated cylinder, in contact with the material. The sound was played and the intensity of the sound waves was measured. This step was repeated twice. The results were recorded. in contact with the material. 7. Step 6 was repeated with the wood, foam, clay, and wool. 8. The average intensity of the sound waves that passed through each material was calculated for all three trials for each material. This was repeated for the intensity of the constant sound source. 9. Lastly, the average intensities of each material was subtracted from the average intensity of the sound source and the decrease of the intensity of the sound waves for each material was found. 10. The results were recorded and compared. |
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