1 zepto is equal to

(A) 10-25

(B) 1025

(C) 10-21

(D) 10-22

(E) None of the above/ More than one of the above

Answer: (C)

A zepto is a unit prefix—like kilo, milli, and centi—in the metric system representing a factor of 10−21, or 0.000000000000000000001.

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