Physics: The science of matter and energy and of interactions between the two; the physical processes and phenomena of a particular system. Table of Contents What is Sound? Properties of a Sound Wave Speed of Sound Constructive and Destructive Interference Diffraction The Doppler Effect Intensity In this section we will be exploring the physics of sound. We will talk about the structure of sound and its components, and we will see the various qualities of sound that make it interesting and useful to understand. You will be able to interactively explore many of the topics, and we hope you will have fun learning. If you ever want to learn about applications of any part of sound, click on the applications image at the bottom of the page. Before we begin, however, we need a basic understanding of what sound actually is . . .