Using the data from BNL$-325,$ compute the mean free paths of neutrons with the following energies in the specified materials: $($a$)14$MeV neutrons in air, water, and uranium $($characteristic of thermonuclear fusion neutrons$),($b$)1$ MeV neutrons in air, water, and uranium $($fast breeder reactor neutrons$),$ and $($c$)0\mathrm{.}05$ eV neutrons in air, water, and uranium $($thermal reactor neutrons$)\mathrm{.}2-11.$ Using the data from BNL$-325,$ compute the mean free paths of neutrons with the

following energies in the specified materials: $($a$)14$MeV neutrons in air, water, and

uranium $($characteristic of thermonuclear fusion neutrons$),($b$)1$MeV neutrons in air,

water, and uranium $($fast breeder reactor neutrons$),$ and $($c$)0\mathrm{.}05eV$ neutrons in air,

water, and uranium $($thermal reactor neutrons$).$