2017.01.02 Phys 2425 Notes Section 13 - Sound.pdf - Sound I...

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Sound I. Introduction to Sound In this chapter, we study sound. Sound is a mechanical wave, and so most of the concepts we learned in the previous chapter apply here as well. Sound is a longitudinal wave, also sometimes called a pressure wave, or a compression wave. As shown in the picture, regions where the particles in the medium are denser are called “compression regions” and regions where the particles in the medium are less dense are called “rarefaction” regions. We will think of the compression locations as crests and the rarefaction regions as troughs. II. Two-Source Wave Interference We now study the type of interference that occurs when there are two independent wave sources. The analysis in this section holds for all types of waves, but we will specifically consider sound waves. Imagine two speakers (wave sources) which are tuned to produce sound waves of exactly the same frequency. The sound waves may overlap constructively, or they may overlap destructively ( Note: they may also overlap neither completely constructively nor destructively, which we call partial interference.
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