Draw schematically the diffusion coefficient d in a log scale versus 1/t (t is temperature in kelvin) for diffusion (i) within crystal bulk, (ii) along grain boundaries, and (iii) on crystal surfaces. briefly explain the reasons why the slopes are different.

What is the typical rotational frequency frot for a molecule like n2 at room temperature (25∘c)? assume that d for this molecule is 1å=10−10m. take the total mass of an n2 molecule to be mn2=4.65×10−26kg. you will need to account for rotations around two axes (not just one) to find the correct frequency. express frot numerically in hertz, to three significant figures.