Question

Which unit given below measures the size of the nucleus?

• A. $\mathrm{amu}$
• B. $\mathrm{angstorm}$
• C. $\mathrm{fermi}$
• D. $\mathrm{cm}$

Answer 1

The correct option is C

$\mathrm{fermi}$

Explanation for the correct option

(C) fermi

• The nucleus is made up of protons (which are positively charged) and neutrons (which are electrically neutral) particles.
• The nucleus' size is measured in fermi from a light nucleus to a heavy nucleus.

Explanation for the incorrect options

• An atomic mass unit (abbreviated as AMU or amu) is defined as $1/12$ the mass of a carbon-12 atom.
• Angstrom is mostly used to measure light wavelengths.
• The centimeter $\left(\mathrm{cm}\right)$ is a metric unit for measuring the length of tiny things.
• Hence, options(A), (B), and (D) are incorrect.

Hence, Option (C) is the correct option. Fermi unit measures the size of the nucleus.