WBCS.LIVE practice question

Which of the following units is used to measure extremely short distances like the diameter of an atomic nucleus?

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. Light year
  2. Astronomical unit
  3. Fermi
  4. Parsec

Correct answer and explanation

Correct answer: Fermi

Explanation: ✅ Correct Answer: C) Fermi 📚 Explanation: A Fermi is a unit of length specifically used in nuclear physics to measure the size of subatomic particles. One Fermi is equal to 10⁻¹⁵ meters. While light years and parsecs are used for massive astronomical distances, the Fermi is essential for expressing the extremely tiny dimensions found within an atom.