# Problem: A small speck of carbon the size of a pinhead contains about 4×1019 atoms, the diameter of a carbon atom is 1.5 10-10 m, and the circumference of the earth at the equator is 40,075 km.How many times around the earth would the atoms from this speck of carbon extend if they were laid side by side?

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A small speck of carbon the size of a pinhead contains about 4×1019 atoms, the diameter of a carbon atom is 1.5 10-10 m, and the circumference of the earth at the equator is 40,075 km.

How many times around the earth would the atoms from this speck of carbon extend if they were laid side by side?