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Physical Chemistry Exam Review 181

Physical Chemistry Exam Review 181 - panels affixed to the...

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Physical Science Activities Manual ________________________________________________________________________________________________________________ ________________________________________________________________________________________________________________ Center of Excellence for Science and Mathematics Education at The University of Martin 3. Total destructive interference can produce "dead" spots in which no sound can be heard. An example is in a large new concert hall. Dead spots are created due to the fact that sound coming from the stage radiates out in all directions. Some of the sound comes directly to your ears from the stage. Some of the sound, however, may hit a wall or ceiling and bounce off and then come to your ears. Now if the rarefactions from the direct sound arrive at your ears at the same time the compressions from the reflected sound, you will hear nothing. They cancel each other out, just like in the rope above. This is why there often are odd shaped panels hanging from the ceiling or
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Unformatted text preview: panels affixed to the sides of the auditorium to keep the sound waves from being reflected in a manner that destructive interference occurs. DESTRUCTIVE INTERFERENCE 4. If two instruments sound the same note and they arrive at your ear at the same time, you will not hear the separate tones they produced but instead you will hear the wave pattern produced due to the addition of the waves from the two instruments. BOTH CONSTRUCTIVE AND DESTRUCTIVE INTERFERENCE 5. What would happen if two identical instruments played the same note, say middle C (512 Hertz) ? What would happen if one of the instruments was a little out of tune and it sounded 516 Hertz instead of 512 Hertz; what would you hear? Lets try it. 6. Get two tuning forks having the same frequency. Tie a rubber band around the one tine of one of the tuning forks. It now will not sound the same...
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