A body centred cubic lattice is made up ...

A body centred cubic lattice is made up of hollow sphere of B. Sphere of solid A are present in hollow sphere of B. Radius of A is half of the radius of B. What is the ratio of total volume of sphere B unoccupied by A in unit cell and volume of unit cell?

`(29 pi sqrt(3))/64`

`(7pi sqrt(3))/(64)`

`(19 pi sqrt(3))/(64)`

`(2pi sqrt(3))/64`

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