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Unformatted text preview: Physics 1240 Homework 2 solutions Brief solutions to homework set #2. Your numbers will be different, but the idea is the same. Im just using sample numbers here. 1. Decide whether each of the following statements are true or false. (a) In this simulation, a darker shade of gray indicates a decrease in pressure compared to the undisturbed air pressure. True. I determined this by looking at the last panel of the simulation, where the air pressure can be reduced to zero by removing all the air from the jar. As the air pressure decreased, the shading inside the jar became a darker gray. (b) If the speaker produces larger fluctuations in pressure, the volume of the tone heard by the listener increases. True. I determined this by increasing the amplitude with the slider control with the sound playing as heard by the listener, and observed that the shading of the sound wave developed higher contrast (corresponding to higher pressure fluctuations) and the sound got louder. (c) To produce a lower pitch tone, the speaker must oscillate back and forth more times each second. False. I determined this by observing that when I change the frequency slider, the rate at which the speaker cone oscillates changes and the pitch I heard also changes. When I decreased the frequency, the speaker oscillated fewer times per second and the pitch of the tone was lower. (d) When the speaker is producing sound waves, the motion of the speaker produces a slight decrease in the pressure in front of the speaker during the forward motion of the speaker head and a slight increase in pressure during the backward motion of the speaker head. False. From the earlier part of this question, I determined that a lighter shade of gray corresponds to an increase in pressure, and I observed that when the speaker moves forward the shade of gray in front of it gets lighter. Therefore when the speaker moves forward it produces a slight increase in pressure....
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This note was uploaded on 08/24/2010 for the course PHYS 1240 taught by Professor Holland,murray during the Spring '08 term at Colorado.
- Spring '08