A nanometer is defined as:

Question

BlackTom AI · Accepted Answer

To evaluate the question, recall the standard metric prefixes and what they represent in meters.
Option 1: 10-6 — this represents 1e-6 meters, which is a micrometer. A micrometer is much larger than a nanometer, so this is not a nanometer.
Option 2: 10-12 — this equals 1e-12 meters, a picometer. While extremely small, it is smaller than a nanometer and thus not the correct scale for a nanometer.
Option 3: 10-3 — this is 1e-3 meters, which is a millimeter. This is several orders of magnitude larger than a nanometer, so it does not describe a nanometer.
Option 4: 10-9 — this is 1e-9 meters, which is the definition of a nanometer. In other words, at the nanometer scale, you are counting down from a meter by nine orders of magnitude, landing precisely at a nanometer.
In summary, understanding the SI prefixes and their corresponding powers of ten clarifies why each option either matches or does not match the nanometer unit, with 1e-9 meters aligning perfectly with the definition of a nanometer.

A nanometer is defined as:

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