Astronomy Practice Exam

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What is the small scale prefix for 0.001?

Pico
Milli
Micro
Nano

The correct answer is: Milli

The prefix that represents 0.001 is "milli," which comes from the Latin word "mille," meaning thousand. In the metric system, milli denotes one-thousandth of a unit. For example, a millimeter is one-thousandth of a meter, and a milligram is one-thousandth of a gram. This makes milli a small-scale prefix that is commonly used in science and engineering to denote measurements that are a fraction of the base unit. The other prefixes listed represent different scales: "pico" represents 10^-12, "micro" represents 10^-6, and "nano" represents 10^-9. Each of these prefixes indicates a smaller fraction of the base unit, but they do not correspond to the value of 0.001. Thus, milli is the precise prefix that indicates one-thousandth, or 0.001.