physics-1300-lab-report-5

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University of Guelph *

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1300

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Physics

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Jan 9, 2024

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Studocu is not sponsored or endorsed by any college or university Physics 1300 Lab Report #5 Physics 1 (University of Waterloo) Studocu is not sponsored or endorsed by any college or university Physics 1300 Lab Report #5 Physics 1 (University of Waterloo) Downloaded by Sama Badreldin (samsooma2004@gmail.com) lOMoARcPSD|24820447
Physics 1300 Lab Report #5 Echolocation and Acoustic Resonance University of Guelph Samantha Halstead Part A: Echolocation Figure #1: Echolocation Peak Figure #2: Full Echolocation Graph Calculations: Speed of sound = v = 332m/s+21.5x0.59m/s/C v = 344.7m/s de = (0.00339583s)(344.7m/s) = 1.17m dt = 0.9m Percent Difference = 1.17m-0.9m/0.9m x100% = 30.1% Downloaded by Sama Badreldin (samsooma2004@gmail.com) lOMoARcPSD|24820447
Question #1: Why do you think the best results are obtained when your phone is 0.5 - 1.0 m from the reflecting surface? I believe that less distance between your phone and the object generates the best results. A distance greater than 1m creates an opportunity for interference and a greater chance the phone will not be able to pick up the waves generated off the wall, producing less accurate results. Additionally, the phone is only able to produce a sound at a certain volume, considerably lower than what animals use, therefore, because the frequency of the sound waves is much lower, the shorter distance is favoured for this lab. Although it is best to not succeed a distance less than 0.5m away from the wall because if so, the intensity of the sound waves being emitted and returning will interfere with each other, causing inaccurate results shown in the graph. Question #2: How precisely could you measure changes in the position of an object using the phyphox echolocation app? Explain how you arrived at your answer. It is possible to measure the changes in the position of the object accurately. As long as the distance the phone is away from the object remains the same and the environment also remains unchanged. For the most accurate results, these variables must be controlled so that nothing can interfere with the results. By keeping the phone in the same location, you could move the object closer/further in the range of 0.5m-1m distance and compare the echolocation peaks after a few trials. I arrived at my answer through my own trial and error through the phyphox app. I studied how the echolocation peaks changed as I moved my phone closer/further away from the wall. I discovered that at a closer range, there was a more noticeable peak in the graph compared to at a farther range where the peak was less. Part B: Resonance Question #3: What is the expected value for the slope? Does your measured value agree with this? If not, identify why this may be the case. The expected value for my slope is -3.714 according to my graph. I found my measured slope, by finding the change in wavelength divided by the change in length, which was calculated to equal -4.204. I believe that my calculation should have been closer to the expected value, in this case, it was higher. This could be because when I was evaluating the point on the graph, they were less consistent as time increased, therefore causing some outliers in the data collected. As Downloaded by Sama Badreldin (samsooma2004@gmail.com) lOMoARcPSD|24820447
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you can see in the graph above there is a gap between the last and second last point and if I took more of those points into consideration, I might have had a value closer to the expected value. Downloaded by Sama Badreldin (samsooma2004@gmail.com) lOMoARcPSD|24820447