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Q.

Which of the following is the smallest unit?

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a

millimetre

b

angstrom

c

fermi

d

metre

answer is C.

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Detailed Solution

$1 m m = 10^{- 3} m; 1 \overset{\circ}{A} = 10^{- 10} m; 1 f m = 10^{- 15} m$

Among the given units fermi is the smallest unit.

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