Question

Which of the following is smallest unit?

• A. Angstrom
• B. Fermi
• C. Mililmetre
• D. Metre

Answer 1

The correct option is B Fermi

We know that
Meter is the SI unit of length.
$1$ milimeter $=\frac{1}{{10}^3}$ meter
$1$ angstrom $=\frac{1}{{10}^{{}^{10}}}$
$1$ fermi $=\frac{1}{{10}^{15}}$
From the above relationships, We can say that fermi has the least value.
Final answer: $\left(c\right)$