ARDMS Ultrasound Physics & Instrumentation Practice Exam

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What does the prefix 'micro' denote in terms of measurement?

Thousandth
Millionth
Billionth
Trillionth

The correct answer is: Millionth

The prefix 'micro' denotes one-millionth, which is a significant factor in various scientific measurements and units. In the International System of Units (SI), 'micro' is represented by the Greek letter 'μ'. Thus, when you encounter units like micrometer (μm) or microgram (μg), it indicates that there are one million of those units in a single unit of the next higher magnitude, like a meter or a gram, respectively. This prefix is crucial in numerous fields, including physics, biology, and medicine, as it allows for precise measurements in contexts where very small quantities are involved. Understanding this prefix helps in interpreting data correctly, particularly in ultrasound physics, where wave patterns and sizes can be extremely small.