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If the density of atoms in a material is 1026 metres-3, and 0.04% of a beam of neutrons is stopped in a 2 cm slab of the material

What is the cross section ??

No idea can anyone supply a formula ??

thanks

2 answers

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If the density of atoms in a material is 10[{MathJax fullWidth='false' ^{26} m^{-3} }], and 0.04% of a beam of neutrons is stopped in a 2 cm slab of the material, what is the cross section?
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