Correct Answer:
A. 10⁻⁹ meters
The nanometer (nm) is a unit of length in the metric system, representing one billionth of a meter. The prefix 'nano-' universally denotes 10⁻⁹. Therefore, 1 nanometer is equal to 10⁻⁹ meters.
- 10⁻⁶ meters corresponds to a micrometer (µm).
- 10⁻³ meters corresponds to a millimeter (mm).
- 10⁻¹² meters corresponds to a picometer (pm).
Understanding these prefixes is fundamental in scientific measurements, especially in fields like nanotechnology and physics, where extremely small scales are common.