Question

Which among the following is the smallest unit of length?

• A. Micron
• B. Fermi
• C. Angstrom
• D. Nanometer

Answer 1

The correct option is B

Fermi

Length:

1. Many prefixes are being utilized for length measurement, ranging from greatest to lowest value of measuring.
2. When calculating the shortest length, the greater the negative power, the lower the number. This same smallest value among such alternatives is fermi.

Tables with all of the values are given below:

$1\mathrm{fermi}$	${10}^{-15}\mathrm{m}$
$1\mathrm{micron}$	${10}^{-6}\mathrm{m}$
$1\mathrm{Angstrom}$	${10}^{-10}\mathrm{m}$
$1\mathrm{nanometer}$	${10}^{-9}\mathrm{m}$

Therefore, the smallest unit of length is $\mathrm{Fermi}$. Hence option B is correct.