What does absorption refer to in the context of sound waves?

• A. Sound waves increase in energy
• B. Sound waves lose energy
• C. Sound waves diffract around obstacles
• D. Sound waves are completely reflected

Answer: (B)

In the context of sound waves, absorption refers to the process by which sound energy is converted to other forms of energy, typically as heat, when sound waves encounter a medium or surface. This loss of energy can occur when sound waves interact with materials that are porous, soft, or textured, which attenuate the sound.

When sound waves travel through a medium and reach a surface, some of the energy from the sound wave is absorbed by that surface rather than being reflected or transmitted. This is crucial in understanding how sound behaves in different environments, such as in concert halls or recording studios, where controlling sound absorption can affect the acoustics of the space.

In contrast, the other options describe different phenomena related to sound waves. For instance, energy increase does not occur during absorption, and diffraction pertains to the bending of sound around obstacles. Complete reflection involves sound bouncing back without being absorbed or transmitted, which is not the definition of absorption.