What is the smallest one$-$dimensional box in which you can confine an electron if you want to know for certain that the electron's speed is no more than $\backslash (10\backslash$mathrm$\{$~m$\}/\backslash$mathrm$\{$s$\}\backslash )?$

Express your answer to one significant figure in micrometers.

$\backslash [$

L$=[\backslash$quad$]\backslash$mu $\backslash$mathrm$\{$m$\}$

$\backslash ]$

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