Below 24.5 k, ne is a crystalline solid with an fcc structure. the interatomic interaction energy per atom can be written as ev14511(ev/atom) where and ơ are constants that depend on the polarizability, the mean dipole moment, and the extent of overlap of core electrons. for crystalline ne, 1-3121 x 10-3 ev and ơ 0.274 nm. a. show that the equilibrium separation between the atoms in an inert gas crystal is given by ro (1.090)o. what is the equilibrium interatomic separation in the ne crystal? b. find the bonding energy per atom in solid ne c. calculate the density of solid ne (atomic mass 20.18).

A3-mm-thick panel of aluminum alloy (k 177 w/m-k, c 875 j/kg-k and ? = 2770 kg/m) is finished on both sides with an epoxy coating that must be cured at or above t,-150°c for at least 5 min. the production line for the curing operation involves two steps: (1) heating in a large oven with air at ts,0-175°c and a convection coefficient of h, 40 w/m2. k, and (2) cooling in a large chamber with air at 25°c and a con- vection coefficient of he 10 w/m2.k. the heating portion of the process is conducted over a time interval te which exceeds the ime required to reach 150°c by 5 min (h = r + 300 s). the coating has an emissivity of ? = 0.8, and the temperatures of the oven and chamber walls are 175 and 25°c, respectively. if the panel is placed in the oven at an initial temperature of 25°c and removed from the chamber at a safe-to-touch tempera ture of 37°c, what is the total elapsed time for the two-step curing operation?