ARDMS Ultrasound Physics & Instrumentation Practice Exam 2026 - Free Ultrasound Practice Questions and Study Guide

Frequency is a parameter that is determined solely by the sound source. In ultrasound, frequency refers to the number of cycles of the sound wave that occur in one second, typically measured in hertz (Hz). When an ultrasound transducer emits sound waves, the frequency is part of the transducer's characteristics and is determined by its design and operating frequency.

Other parameters like amplitude, wavelength, and propagation speed depend on different interactions. Amplitude is related to the strength or intensity of the sound wave and can be influenced by factors such as the distance from the source and the medium through which the sound travels. Wavelength is the distance between successive peaks of the wave, which is determined by both frequency and the speed of sound in the medium. Propagation speed varies depending on the medium's density and elasticity; for instance, sound travels faster in solids than in liquids or gases. Therefore, while frequency is inherent to the sound source itself, the other parameters depend on the medium and other external factors.