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Lab 6 - Experiment 6-1(Sound in Solids Objective To...

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Experiment 6-1 (Sound in Solids) Objective : To demonstrate how sound travels through solids. Results, Explanations, Conclusions : For part one of this experiment we had a partner tap a dowel on the table. We observed the sound. Then we put our ears to the table and had our partner tap again. For the second part of this experiment we scratched the end of the dowel and listened to the sound that was created. Then we touched one end of the dowel to our ears and scratched the other end of the dowel again. We compared the sounds that were heard. For the third part of this experiment we hit a hanger against a table and listened to the sound that it made. Then we tied an end of a string to each of the corners of the hanger. We wrapped the other ends of the strings around the tips of our index fingers. Then we placed the tips of our fingers in each ear. We leaned over so that the hanger hung freely and had our partner tap the hanger again. For the fourth part of this experiment we had us and a partner talk through the string telephone. When we put our ears to the table and to the dowel, the sound got louder. When the string was held to our ears the sound got louder and had a lower pitch. Through the string telephone you could hear not perfectly but well enough to understand. When the sound was traveling through the string telephone, it echoed through the cup and sounded muffled. This is because there were more molecules. There is some interference but the sound still travels better through solids. This tells us that sound traveling through solid objects is louder and more magnified and you can hear it better. The reason for this is that in solids the molecules are more tightly packed and passes vibration on easier because of how close they are. Teaching Applications : -“Phone Unplugged”: For this experiment demonstrate to the children what happens when you put a cellular phone on the table and in the air. On the table the vibration is louder than when you just hold it in the air. Explain and discuss that the reason for this is because of how sound travels and that when it travels through solids it appears to be louder. -“Dr. Hear”: In this experiment bring in a stethoscope and demonstrate to the children how you can hear through it. Discuss with them that the sound that you hear through the stethoscope is louder than if you were to try and listen without one. This again is a demonstration of how sound travels better through solids.
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Experiment 6-2 (Reflection) Objective : To demonstrate angles of reflection and incidence. Results, Explanations, Conclusions : For this experiment we went to a dark spot in the room. We then held a mirror in the beam of light so that the light is reflected in the mirror. Then we held the mirror at different angles. We noticed the angel at which the light is reflected in relation to its source.
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