Which of the following is the smallest unit?

millimetre

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angstrom

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fermi

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metre

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Solution

The correct option is C fermi
Metre is the SI unit of length.
$1 m i l l i m e t r e = 10^{- 3} m e t r e$
$1 a n g s t r o m = 10^{- 10} m e t r e$
$1 f e r m i = 10^{- 15} m e t r e$
So, fermi is the smallest unit.

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