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A speck of dust is 1.2 x 10-6 m wide. Which of the following is the best wayto rewrite this quantity, using more appropriate units?A. 1.2 x 10-4 cmB. 1.2 x 10-9 kmC. 1.2 x 10-3 mmD. 1.2 x 10-6 mSUBMIT
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A speck of dust is 1.2 x 10-6 m wide. Which of the following is the best wayto rewrite this quantity, using more appropriate units?A. 1.2 x 10-4 cmB. 1.2 x 10-9 kmC. 1.2 x 10-3 mmD. 1.2 x 10-6 mSUBMIT

User Snakehiss
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1 Answer

4 votes

The given quantity is


1.2\ast10^(-6)m

The general conversion rules are


\begin{gathered} 1\operatorname{cm}=10\operatorname{mm} \\ 1m=100\operatorname{cm} \\ 1\operatorname{km}=100m \end{gathered}
\begin{gathered} So \\ 1.2\ast10^(-6)m=1.2\ast10^(-6)\ast1m=1.2\ast10^(-6)\ast100\operatorname{cm} \\ =1.2\ast10^(-6)\ast100\ast10\operatorname{mm}=1.2\ast10^(-3)\operatorname{mm} \end{gathered}

The answer is option c.

User Secan
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7.9k points
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