(B) The micrometer,denoted by the symbol $\mu m$,is a unit of length in the metric system.By definition,$1 \, \mu m$ is equal to one millionth of a me

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(B) The micrometer,denoted by the symbol $\mu m$,is a unit of length in the metric system.By definition,$1 \, \mu m$ is equal to one millionth of a meter.Mathematically,this is expressed as $1 \, \mu m = 10^{-6} \, m$.It is also equivalent to $10^{-4} \, cm$,$10^{-3} \, mm$,or $1000 \, nm$.