Post Lab 10 - S and L S ? 6. Suppose we have a 42.2 kg mass...

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Lab 10: Standing Waves 1. The fundamental mode of a given string under a given tension is at frequency f 1 . If we pulled the string 4 times tauter, what is now the frequency of the new fundamental mode in terms of the old f 1 ? 2. If you replaced the string with a light-weight thread of 1/9 th its mass per unit length, how would the frequency change? 3. How are the frequencies of various modes ( n =1 is the first mode, n =2 is the second) related? The answer should be of the form f n =something with an f 1 in it.? 4. What is the “end effect” in this experiment? What part of your graph shows this end effect? 5. Why did we use a long string length for M
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Unformatted text preview: S and L S ? 6. Suppose we have a 42.2 kg mass hanging on a steel wire over a pulley, like in our experiment. We have 0.8 mm diameter wire, made out of carbon steel (mass density = 7860 kg/m 3 ). What is the linear mass density? The length that is free to vibrate is 64 cm. If plucked or struck, assume you will mostly hear the n=1 standing wave. What is the fundamental mode (n=1) for the string? If you were standing near the string, what note would you hear? (pick closest one) ( http://www.phy.mtu.edu/~suits/notefreqs.html will help)...
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