Question:
The value of one barn in SI unit is
The value of one barn in SI unit is
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1 barn = 100 fm\(^2\) (femtometer squared), and 1 fm = \(10^{-15}\) m.
Updated On: Apr 24, 2026
- \(10^{-28} m^2\)
- \(10^{-20} m^2\)
- \(10^{-16} m^2\)
- \(10^{-32} m^2\)
- \(10^{-15} m^2\)
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
A barn is a unit of area used in nuclear physics to express the cross-section of nuclear reactions.
Step 2: Detailed Explanation:
1 barn is defined as \(10^{-28}\) square meters (m\(^2\)). It is approximately the cross-sectional area of a uranium nucleus. The name "barn" was coined during the Manhattan Project as a colloquialism for "as big as a barn" to describe the relatively large cross-section of certain nuclear reactions.
Step 3: Final Answer:
One barn = \(10^{-28} m^2\).
A barn is a unit of area used in nuclear physics to express the cross-section of nuclear reactions.
Step 2: Detailed Explanation:
1 barn is defined as \(10^{-28}\) square meters (m\(^2\)). It is approximately the cross-sectional area of a uranium nucleus. The name "barn" was coined during the Manhattan Project as a colloquialism for "as big as a barn" to describe the relatively large cross-section of certain nuclear reactions.
Step 3: Final Answer:
One barn = \(10^{-28} m^2\).
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