Which among the following is the smallest prefix?

milli

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nano

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fermi

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deci

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Solution

The correct option is C fermi
Here, $1$ milimeter $= 10^{- 3}$ meter ;
$1$ angstrom $= 10^{- 10}$ meter ;
$1$ fermi $= 10^{- 15}$ meter,

Therefore, the smallest prefix is for fermi.

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