Which one of the following is the value of one nanometer?

Which one of the following is the value of one nanometer?

10<sup>-7</sup> cm
10<sup>-6</sup> cm
10<sup>-4</sup> cm
10<sup>-3</sup> cm
This question was previously asked in
UPSC CDS-1 – 2018
One nanometer (nm) is a unit of length equal to 10⁻⁹ meters (m). To convert meters to centimeters (cm), we use the conversion factor 1 m = 100 cm = 10² cm.
So, 1 nm = 10⁻⁹ m = 10⁻⁹ × (10² cm) = 10⁻⁹⁺² cm = 10⁻⁷ cm.
– The prefix ‘nano’ (n) represents a factor of 10⁻⁹.
– The base unit of length in SI is the meter (m).
– 1 meter = 100 centimeters = 10² cm.
– To convert from meters to centimeters, multiply by 10².
Nanometers are commonly used to measure wavelengths of visible light, distances in atomic and molecular structures, and in nanotechnology. Other related units include micrometers (µm, 10⁻⁶ m) and picometers (pm, 10⁻¹² m).
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