(A) We know that $1 \mu m = 10^{-6} \text{ m}$ and $1 \text{ nm} = 10^{-9} \text{ m}$.Thus,the ratio of $1 \text{ micron}$ to $1 \text{ nanometer}$ is

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(A) We know that $1 \mu m = 10^{-6} \text{ m}$ and $1 \text{ nm} = 10^{-9} \text{ m}$.Thus,the ratio of $1 \text{ micron}$ to $1 \text{ nanometer}$ is given by:$\frac{1 \mu m}{1 \text{ nm}} = \frac{10^{-6} \text{ m}}{10^{-9} \text{ m}} = 10^{-6 - (-9)} = 10^3$.