Week One Notes
Week One Notes PHYS 1270
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This 4 page Class Notes was uploaded by Kait Brown on Monday September 5, 2016. The Class Notes belongs to PHYS 1270 at University of North Texas taught by Cheryl Lawler in Fall 2016. Since its upload, it has received 35 views. For similar materials see Science and Technology of Musical Sound in Physics at University of North Texas.
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Date Created: 09/05/16
Weekly Notes PHYS 1270.001 Science and Technology of Musical Sound Week one Unit One Sound as a Wave Unit One Sound o Longitudinal wave o Travels through a material medium Wave o Change or disturbance that travels from one place to another o Sound is a mechanical wave Mechanical Waves Require o Some source of disturbance (sound) o A medium (air, water, etc.,) that can be disturbed o Some physical mechanism through which elements of the medium can influence each other (atoms bouncing off each other, helping to transport the wave). Longitudinal Waves o Conga line o Sound Wave or disturbance Material Medium Transverse Waves o Audience wave o Light Why does sound not move in a vacuum? Because there is no matter! A vacuum contains no air, water, or other material mediums that sound needs in order to travel, so it cannot travel when it originates inside a vacuum. Radio waves are NOT sound. Instead, they’re electromagnetic waves. Sound information is coded in the amplitude (AM) or frequency (FM) of the radio waves. Lightning is a high energy electrical discharge. When lightning strikes, the air gets very hot very quickly, causing the particles to explode. This explosion sound sends a shockwave to our ears, allowing us to hear thunder. Velocity of a wave is the distance a point on the wave travels in an d allotted time. The formula for this is v= t •A • B Distance between points A and B= 1 m Time=.8 sec v=d/t 1.25 m/s =1m/.8s Sound is nondispersive. This means that its velocity is in no way affected by its frequency. No matter how many of the above waves are produced by that sound, the velocity of the waves in this example will ALWAYS be 1.25 m/s. At room temperature of 20° the velocity of sound is always 343 m/s.
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