The book Principles of Physics was written by author Willis E Willis Eugene Tower Here you can read free online of Principles of Physics book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Principles of Physics a good or bad book?
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Longitudinal Waves. Another kind of wave is found in bodies that are elastic and compressible and have inertia, such as gases and coiled wire springs. Such waves may be studied by as the medium through which the waves pass. (See Fig. 318. ) If the end of the wire spring shown in Fig. 317 is struck the first'few turns^of the spring will be compressed. Since the spring possesses elasticity, the turns will move forward a little and compress those ahead, these will press the next in turn and so on.... Thus a compression wave will move to the end of the spring, where it will be reflected and return. Consider the turns of the spring as they 356 PRINCIPLES OF PHYSICS move toward the end. On account of their inertia they will continue' moving until they have separated from each other more than at first, before returning to their usual position. This condition of a greater separation of the turns of the spring than usual is called a rarefaction. It moves along the spring following the wave of compres- sion.
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