Which term describes the problem of signals weakening as they travel across media?

The term that describes the problem of signals weakening as they travel across media is "attenuation." Attenuation refers to the reduction in strength or intensity of a signal as it propagates through a medium, such as fiber optic cables, air, or electrical circuits. This phenomenon can occur due to various factors, including absorption, scattering, and dispersion, impacting the quality and clarity of the transmitted information.