Sonography Principles & Instrumentation Practice Test 2026 – Complete Exam Prep

The term for the time it takes for one complete cycle to occur in a waveform is called the period. The period is measured in units of time, typically seconds, and is a fundamental concept in understanding wave behavior, including sound waves used in ultrasound.

In ultrasound, understanding the period is crucial because it relates directly to the frequency of the sound wave. While frequency refers to how many cycles occur in one second and is measured in Hertz (Hz), the period tells us how long one cycle lasts. These two are inversely related; as the frequency increases, the period decreases, and vice versa.

The other terms listed do not refer specifically to the time taken for a single cycle. Frequency denotes the rate of cycles per second, wavelength refers to the distance between successive peaks of a wave, and pulse duration pertains to the time that a pulse of ultrasound is emitted, which is not the same as the period of a single cycle. Understanding these distinctions is essential for effective grasp of ultrasound principles.