In ball mill operation, the feed size (D_{f} in meters) and the ball diameter (D_{b} in metres) are related as ( where, K = grindability constant (varying from 0.9 to 1.4 in increasing order of hard ness))
Pick out the correct statement.
The sphericity of a solid particle of cubical shape is
Velocity of a small particle of diameter 'D_{p}' at a distance 'r'
from the rotational axis of a cyclone rotating at an angular speed `omega`
is given by (the other symbols are as per standard notation)
The specific surface of spherical particles is given by (where D and`rho` are diameter and density of particle).