Calculate the energy levels for hydrogen's 7d subshell when hydrogen is in an external magnetic field B pointing in the z direction. Express your answer in terms of the Bohr magneton. (Use the following as necessary: B and μBohr. Do not use other variables, substitute numeric values. Assume that E is in electron-volts, B is in teslas, and μBohr is in electron-volts per tesla. Do not include units in your answer.)

Asheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200oc and is permitted to achieve a steady-state diffusion condition. the diffusion coefficient for nitrogen in steel at this temperature is 6 x 10- 11 m2 /s, and the diffusion flux is found to be 1.2 x 10-7 kg/m2 -s. also, it is known that the concentration of nitrogen in the steel at the high-pressure surface is 4 kg/m3 . how far into the sheet from this high-pressure side will the concentration be 2.0 kg/m3 ? assume a linear concentration profile.