The rate at which amplitude decreases as sound propagates depends on the characteristics of both the ____ and the ____.

• A. Sound wave and Medium
• B. Frequency and Wavelength
• C. Time and Distance
• D. Pressure and Density

Answer: (A)

Attenuation is about how the wave’s energy fades as it moves, which depends on two things: what the sound wave is like and what the medium is like. The wave’s own characteristics, especially its frequency content and initial amplitude, interact with the medium’s properties to determine how quickly energy is lost. The medium’s absorption, scattering, density, and impedance influence how efficiently the wave’s energy is converted to heat or redirected. Higher frequencies often attenuate more in many materials, so the same wave will diminish differently in different media. That combination—the nature of the sound wave and the properties of the medium—drives the rate of amplitude decrease.