ARDMS Ultrasound Physics & Instrumentation Practice Exam 2025 - Free Ultrasound Practice Questions and Study Guide

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What property of an object describes its ability to resist compression?

Density

Stiffness

The property that describes an object's ability to resist compression is referred to as stiffness. Stiffness quantifies how much a material deforms under a given load—or compression—indicating how rigid the material is. A stiffer material will exhibit less deformation when a compressive force is applied, demonstrating greater resistance to being compressed.

In contrast, density relates to the mass per unit volume of a substance and does not directly indicate how much that substance can withstand compression. Elasticity refers to the ability of a material to return to its original shape after deformation, which is relevant but distinct from simply resisting compression. Sonic speed, on the other hand, is a measure of how fast sound waves travel through a material and is influenced by both stiffness and density, but does not reflect the material's ability to resist compressive forces directly.

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Elasticity

Sonic speed

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