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(D) The size of an atomic nucleus is extremely small,typically on the order of $10^{-15} \ m$. In physics,the unit $1 \ 	ext{fermi}$ (also known as a

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Fermi

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(D) The size of an atomic nucleus is extremely small,typically on the order of $10^{-15} \ m$. In physics,the unit $1 \ 	ext{fermi}$ (also known as a femtometre) is defined as $1 \ 	ext{fm} = 10^{-15} \ m$. Since nuclear radii are measured in the range of $1$ to $10 \ 	ext{fm}$,the $Fermi$ is the standard and most appropriate unit for this measurement. Therefore,the correct option is $(d)$.

Which is the correct unit for measuring nuclear radii?

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