Which term describes the vehicle through which a wave travels from point to point?

The term that describes the vehicle through which a wave travels from point to point is "Medium." In wave theory, a medium is essential as it is the material or space that facilitates the propagation of waves. This can include solids, liquids, gases, or even vacuum for electromagnetic waves.

For example, sound waves travel through air (a gaseous medium), while water waves move through the surface of the water (a liquid medium). The characteristics of the medium, such as its density and elasticity, significantly affect how waves propagate through it, including their speed and attenuation.

In contrast, the other terms refer to different concepts: "Source" pertains to the origin of the wave, such as a vibrating string for sound. "Frequency" describes the number of wave cycles that occur per second and is a characteristic of the wave itself rather than the medium. "Waveform" refers to the shape of the wave, visualized typically on a graph, which delineates how the wave varies with time or space. Understanding these distinctions helps clarify the role of the medium in wave propagation.