Packing fraction of an identical solid sphere is `74%` in :

Packing fraction is related to :

Two identical spheres are rolling down the slope. One is solid and other is hollow, the ratio of moment of inertia of solid sphere (axis of rotation is diameter) to that of the hollow is …………….

The only incorrect statement for the packing of identical spheres in two dimension is:

How many types of close-packing are possible when identical spheres pack together in a plane? Which one of these represents the highest efficiency in close-packing in two dimensions? Mention coordination number in each of these close-packing.