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Physics

Which of the following is the smallest unit?

  1. Millimetre
  2. Angstrom
  3. Fermi
  4. Metre

Measurements

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Answer

Fermi

Reason — Fermi is 10-15th part of a metre. i.e., 1 fermi = 10-15 m, hence it is the smallest unit.

Angstrom = 10-10th part of a metre.
Millimetre = 10-3th part of a metre.

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