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Good Vibrations

Good Vibrations. By: Elena Wernecke. Introduction.

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Good Vibrations

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  1. Good Vibrations By: Elena Wernecke

  2. Introduction I chose to experiment with a project on sound waves. I chose this project because it seemed like it could help me understand the movement of sound waves and how they affect matter in front of them. I also thought I would learn about frequency. Turned out, I learned about all of that. This project explained what sound waves do and how frequency determines whether you can see the vibration or not. Good Vibrations

  3. Hypothesis My hypothesis was that when I introduce sound into a balloon-covered can with a light reflecting off of a mirror on the balloon onto the wall, I will be able to see that sound waves exist by the movement of the light on the wall.

  4. Supplies Needed • Empty soup can (don’t forget to recycle after the experiment!)  • Can opener • Balloon • Flashlight • Small mirror • Scissors • Rubber band • Glue Good Vibrations

  5. Directions • 1. Remove both ends of the soup can with the can opener. • 2. Stretch a deflated balloon around one of the soup can’s ends and secure it with a rubber band. • 3. Glue a small mirror to the balloon with the reflective side facing up. • 4. Place the can on the table and secure it so it doesn’t roll away. • 5. Shine the flashlight onto the mirror at an angle so it reflects on the wall. • 6. Clap and shout into the open end of the can Good Vibrations

  6. Test Number 1 The first test I did was with a small can, 3.5 inches in diameter. The balloon was stretched tautly over the end of the can. After aiming the flashlight to bounce off of the mirror and onto the wall, I clapped into the open end of the can. I sat there, waiting for results and….. Nothing. Absolutely nothing. Then I talked into it… nothing. I raised the amplitude and yelled into it and once again…nothing. I pondered why nothing happened, and then an idea popped into my head. I thought, because the balloon is so tightly stretched, there must be a super high frequency and because of that, the vibration was hardly noticeable. Added on to that, I noticed that the mirror took up almost all of the space on the balloon which weighed it down even more. I then decided to take another test. Good Vibrations

  7. Hypothesis Confirmation Test #1 • No light movement registered on the wall. • Unsure because of tight balloon or weighing-down mirror. • Hypothesis unproven after first test.  Good Vibrations

  8. Test Number 2 For the second test, I used a bigger can (6 inches in diameter). I stretched the same balloon over it and glued the same compact mirror to it. I clapped into it, hoping for better results. I looked at the wall and saw a vibration. I was so happy to get an actual result that I exclaimed, “Yes!” into the open end, creating an even bigger vibration shown on the wall. Good Vibrations

  9. Hypothesis Confirmation Test #2 • Movement of the light reflecting on the wall registered after changing the size of the can (variable) and lessened the tautness of the balloon. • Hypothesis proven correct. Sound waves exist!! Yeah! Right Wrong Good Vibrations

  10. Test #1 Unseen results probably caused by amount of balloon covered up by mirror. No movement of the light at all. Hypothesis unproven. Test #2 Saw sound wave results because of the larger can. The light reflecting on the wall moved! Hypothesis proven. Comparing Results Good Vibrations

  11. Conclusion This experiment has shown me that sound waves do exist. The sound waves bounced off the balloon and vibrated the mirror, which was shown in the reflection of light on the wall. Now, I am wondering if this experiment would still work with a radio playing in front of the can. But that will have to wait until next time……

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