(D) In a colloidal system,the size of the dispersed phase particles typically ranges from $1 \ nm$ to $1000 \ nm$.Converting these values to meters,we

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(D) In a colloidal system,the size of the dispersed phase particles typically ranges from $1 \ nm$ to $1000 \ nm$.Converting these values to meters,we get $1 \times 10^{-9} \ m$ to $1000 \times 10^{-9} \ m$,which simplifies to $10^{-9} \ m$ to $10^{-6} \ m$.Therefore,the correct range is $10^{-9} \ m$ to $10^{-6} \ m$.