Under different conditions an element crystallizes in bcc and fcc having edges "300 and "400" pm respectively. The ratio of their densities would be

A metal can be crystallized in both BCC and FCC unit cells whose edge lengths are 2 pm and 4 pm respectively. Then ratio of densities of FCC and BCC unit cells is

The density and edge length values for a crystalline element with fcc lattice are 10 g cm^(-3) and 400 pm respectively. The number of unit cells in 32 g of this crystal is

A metal crystallise into two cubic phases FCC and BCC whose unit cell lengths are 2.5 and 2.0 A^0 respectively, the ratio of densities of BCC and FCC

An element crystallizes in a structure having FCC unit cell of an edge length of the unit cell is 286pm, the radius of iron atom is