Nanotechnology — Quiz

Question 9 • Physics

Which choice correctly ranks these items from smallest to largest ? carbon atom comma E. coli bacteria cell electron quantum dot

Answer

carbon atom right arrow electron right arrow E. coli bacteria cell right arrow quantum dot right arrow comma

electron right arrow carbon atom right arrow comma right arrow E. coli bacteria cell right arrow quantum dot

comma right arrow carbon atom right arrow E. coli bacteria cell right arrow quantum dot right arrow electron

electron right arrow carbon atom right arrow quantum dot right arrow E. coli bacteria cell right arrow comma

Explanation

An electron is much smaller than a carbon atom. A carbon atom is about 0.1 nanometer across, while a quantum dot is made of many atoms and is typically a few nanometers across. An E. coli cell is much larger still, usually around a micrometer long. So the order from smallest to largest is electron, carbon atom, quantum dot, then E. coli cell—the order in choice D.

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