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California State University, Fullerton *

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101

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Mechanical Engineering

Date

Dec 6, 2023

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pdf

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Uploaded by Annahamed2003

1.Imagine removing the sound post from an inexpensive violin. If you were then to play the instrument, describe your impression of the difference in sound before and after the post is removed, and why this should be the case. - The sound post is a small wooden dowel that sits in the violin body, this serves to transmit vibrations from the top plate to the back plate of the instrument, helping to amplify the sound and create resonance. If the sound post were removed from a violin, the resulting sound would likely be a lot quieter, thinner, and less resonant than before. The absence of the sound post would make the instrument's top and back plates less rigid and cause them to vibrate in a less controlled and balanced manner, this would result in a less coherent and less focused sound. Without the sound post, the instrument's sound would lack the depth, and projection which are essential for a violin's sound. The loss of the sound post would likely make the instrument sound unbalanced, with the treble notes much louder than the lower range, which could also cause pitch issues. Removing the sound post from a violin would have a significant impact on the instrument's sound, making it quieter, less resonant, and less balanced. Therefore its not recommended to remove the sound post from any violin, even with its price point, it is a crucial component of the instrument's sound and shouldn’t be tampered with. 3. What difference should it make to a violin's sound if it had no f-holes? Explain how the vibrational characteristics of the body would change. - F-holes are an essential feature of a violin's design and have an important role in the instrument's acoustics. The f-holes are the two openings on the top plate of the violin, just below the bridge. They allow the sound waves generated by the vibrating strings to escape from the body of the instrument and project outwards. If a violin had no f-holes, the sound produced by the instrument would be significantly different. The f-holes are carefully designed and placed to allow for specific types of vibrations within the instrument. Without the f-holes, the vibrations in the instrument's body would be more confined, leading to a less resonant sound with less projection. Without the f-holes, the top plate would likely vibrate differently, leading to a sound that is less balanced and less nuanced. Furthermore, f-holes have an impact on the air pressure inside the instruments. This allows for the exchange of air between the inside and outside of the violin, which is essential for creating the instrument's sound. Without the f-holes, the air pressure inside the violin would be different, leading to a less full sound from the violin. 4.If a violin A4 string has a length of 35 cm and is tightened to a tension of 60 N, what mass density should the string have? - velocity=wavelength x frequency v=(√60N/ μ)^2 = (308)^2 94.864= 60/N 60/94,864=. 00063 kg/m

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