What phenomenon occurs due to signals taking multiple paths to reach the receiver?

• A. Signal reflection
• B. Multipath propagation
• C. Signal distortion
• D. Radio wave scattering

Answer: (B)

The phenomenon that occurs when signals take multiple paths to reach the receiver is referred to as multipath propagation. This occurs most commonly in environments with obstacles, such as buildings or hills, which cause the radio waves to reflect, refract, or diffract as they travel towards their destination. As a result, the same signal can arrive at the receiver at different times and in different phases, leading to constructive or destructive interference. The characteristics of this interference can significantly affect the quality of the received signal, sometimes enhancing the signal but often leading to issues like signal fading or distortion.

Signal reflection and radio wave scattering are components of the multipath propagation phenomenon, as they describe specific ways that signals interact with the environment. However, they do not encompass the broader scenario that multipath propagation covers. Signal distortion typically refers to changes in the waveform or quality of a signal due to various factors, but it doesn't specifically describe the multiple path phenomenon itself. Therefore, multipath propagation is the most accurate term to describe the situation where signals arrive at a receiver via multiple routes.