Which term best describes a recurring disturbance that advances through space and can occur with or without a traditional medium?

• A. Wave
• B. Wave motion
• C. Pulse
• D. Signal

Answer: (B)

The idea being tested is how a repeating disturbance propagates through space. When a disturbance repeats over time and travels, we describe that propagation as wave motion. This term emphasizes the way the disturbance carries energy through space, and it applies whether the wave travels through a traditional medium (like sound in air) or through a vacuum (like light). A pulse is a single, finite burst of disturbance, not recurring. A signal is information carried by or modulated onto a wave, but it isn’t the propagation itself. So, wave motion best captures a recurring disturbance that advances through space, with or without a traditional medium.