List of top Geophysics Questions

The inter-molecular distance between two atoms of a hydrogen molecule is $0.77 \, \text{\AA}$, and the mass of a proton is $1.67 \times 10^{-27} \, \text{Kg}$. The moment of inertia of a molecule is:

Consider phosphorus doping in silicon, for $T = 300 \, \text{K}$, at concentration $N_d = 10^{16} \, \text{cm}^{-3}$. The fraction of total electrons still in the donor states is: