Which phenomenon describes the weakening of a signal over distance?

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Signal attenuation refers to the loss of signal strength as it travels through a medium, such as air, fiber optic cables, or electrical cables. This weakening occurs due to several factors, including absorption, scattering, and reflection, which affect the signal's ability to maintain its original strength over longer distances. Understanding attenuation is critical in fields like telecommunications, where maintaining signal quality is essential for effective communication.

Other terms like signal modulation, signal noise, and signal encryption address different aspects of signal processing and communication. Modulation involves altering a signal to carry information; noise refers to unwanted disturbances that can interfere with signal clarity; and encryption is related to securing data by making it unreadable without the proper key. While these concepts are important in their own right, they do not specifically pertain to the weakening of a signal over distance, distinguishing attenuation as the suitable answer to understand the decline in signal strength experienced during transmission.