One barn, a unit used for cross sections in nuclear and particle physics,  is equal to 10-28 square meters, about the cross-sectional area of a uranium nucleus. Assuming an atom is perfectly spherical and it has a diameter  of 0.386 nm, determine its cross section in barns.  Express your answer in scientific notation.

An Introduction to Physical Science
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Author:James Shipman, Jerry D. Wilson, Charles A. Higgins, Omar Torres
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Chapter1: Measurement
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One barn, a unit used for cross sections in nuclear and particle physics,  is equal to 10-28 square meters, about the cross-sectional area of a uranium nucleus.
Assuming an atom is perfectly spherical and it has a diameter  of 0.386 nm, determine its cross section in barns. 
Express your answer in scientific notation.

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