ARDMS Sonography Principles and Instrumentation (SPI) Practice Exam 2025 - Free Sonography Exam Questions and Study Guide

Question: 1 / 745

What term is used to describe the material through which sound travels?

Particle

Vacuum

Medium

The term used to describe the material through which sound travels is "medium." In the context of ultrasound and sonography, a medium refers to any substance — whether solid, liquid, or gas — that allows sound waves to propagate. Sound requires a medium for transmission because it travels as a mechanical wave, relying on particle interactions within the medium to convey the energy of the sound.

In a solid, the tightly packed particles allow for efficient sound transmission, while in a liquid, sound travels more slowly than in solids but faster than in gases. When sound travels through a vacuum, there are no particles to transmit the sound waves, which is why sound cannot propagate in such an environment. Frequency, while essential to describe the sound wave's characteristics, does not pertain to the medium itself. Understanding the role of the medium is crucial for effective imaging and diagnosis in sonography.

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