lab 5 - Experiment 5 Sound Abstract The purpose of this...

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Experiment 5: Sound Abstract The purpose of this experiment was to measure the speed of sound in air by three different methods. First, we produced a sharp sound near a microphone connected to a storage oscilloscope, which measured the distance it took to travel to the wall and reflect back to us. We then used a tuning fork over a column of water and measured the amount of water in the column it required to make the loudest sound, allowing us to find wavelength and then speed. Finally, we used transducers, which convert ultrasound to electrical oscillations, and by measuring the wavelengths of the visual representations of the oscillations, we were able to calculate speed of sound. Questions 1. a. In a transverse wave, the displacement of the medium is perpendicular to the direction of the propagation of the wave. Because there is no way to create motion that is perpendicular to the propagation of the wave in gases or liquids, transverse waves cannot exist in these forms. They can either occur on the surface of a liquid or throughout a solid. A longitudinal wave, on the other hand, has displacement of the medium that is parallel to the wave: for example, sound waves. b. The wavelength of a traveling wave is the distance between two crests. Frequency is the number of waves that pass through a specific point in a given amount of time. Speed is the distance traveled in a certain amount of time. The relationship between these three measurements is wavelength = speed / frequency.
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2. Pitch is the frequency of a sound, whereas loudness depends on the amplitude, or size of the waves. Therefore, pitch has to do more with speed, so someone shouting with a high pitch would be heard before someone shouting very loudly.
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This note was uploaded on 11/17/2011 for the course PHYSIC 133 taught by Professor Staff during the Fall '10 term at UMass (Amherst).

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lab 5 - Experiment 5 Sound Abstract The purpose of this...

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