Question

One nm is equal to:
A. ${10^{ - 9}}m$
B. ${10^{ - 7}}m$
C. ${10^{ - 8}}m$
D. ${10^{ - 6}}m$

Answer 1

Hint: All units are derived from the International System of units which are accepted in almost all countries in the world. They are defined based on precise and definite standards and we can derive one SI unit from another without using conversion factors.

Complete step by step answer:
The nanometer is the unit of length in the metric system. Formerly, the nanometer was known as the millimicrometer because it is the 1/1000 of micron or micrometer. The name nanometer combines the SI prefix nano which is taken from the ancient Greek with parent unit meter. The prefix nano means one-billionth or we can say one nanometer looks like ${10^{ - 9}}$m.
Since the nanometer is so small it is invisible to the human eye. Thus the nanometer is used to measure the microscopic things both natural and man-made such as atoms molecules and the very small component used in computer processors.

So, the correct answer is Option A.

Additional Information:
The traditional units that we encounter in our daily life are measured based on thongs that we can easily relate, but in the case of SI units they are measured based on scientific methods. Also in the case of derived units, as we use a prefixed base unit, it can often become confusing, and also we might not be able to relate it to our daily life. But the simplicity, precision, and ease of understanding that we get by maintaining a universal metric system overcome all difficulties.

Note: The SI units are classified as Base units and Derived units. The base units are fundamental units and all other units are derived from it. We have seven base units and we determine the dimensions of derived units in terms of base units.