How many number of tetrahedral voids are formed in $$5 \mathrm{~mol}$$ of a compound having cubic close packed structure? (Choose the correct option)

How are edge length '$$a$$' of the unit cell and radius '$$r$$' of the sphere related to each other in ccp structure? (Choose correct option for your answer)

A compound is formed by two elements A and B. The elements B forms cubic close packed structure and atoms of A occupy $$1 / 3$$ of tetrahedral voids. If the formula of the compound is $$\mathrm{A}_{x} \mathrm{B}_{y}$$, then the value of $$x+y$$ is in option

What fraction of one edge centred octahedral void lies in one unit cell of fcc?