wave - 56 Experiment X: Waves and Resonance Goals • Study...

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56 Experiment X: Waves and Resonance Goals Study standing waves on a string under tension Experimentally determine the relationship between velocity of wave propagation, tension in the string, and the linear density of the string Introduction and Background Waves : A wave is the propagation of vibration in a medium. The velocity at which a vibrational wave propagates through a medium depends not only on the properties of the medium, but also on the external conditions imposed on it. For example, the velocity, V, with which a transverse vibrational wave travels down a string or flexible wire would depend on the linear density (mass per unit length), μ , of the string, as well as the tension, T, in the string. The tension supplies the restoring force when the string is given a transverse displacement, and the linear density determines the inertia of the string and thus its speed of response to the tension. Therefore, we would expect that the velocity would increase with increasing tension and decrease with increasing linear density. Based on these arguments we can assume a power law relationship between V, T and μ of the form b a m T C V = (10-1) where C is a constant and α and β are the exponents. We expect C , α , and β to be positive integers or simple fractions. As discussed in Experiment III (Centripetal Force), the standard way to determine the power law exponents is to create a log-log plot and the slope of that plot would yield the exponent. Standing Wave : If you vibrate one end of a string and keep the other end fixed, a continuous wave will travel down the string to the fixed end and be reflected back. Hence on the string there will be waves traveling in both directions and they will interfere with each other. Usually this results in a jumble. But with just the right combinations of the vibration frequency and tension in the string, the two traveling waves will interfere in such a way that there will be a large amplitude fixed pattern on the string, as shown in Figure 10-1. These fixed patterns are called
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This note was uploaded on 11/10/2011 for the course PHY 2053 taught by Professor Lind during the Fall '09 term at FSU.

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wave - 56 Experiment X: Waves and Resonance Goals • Study...

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