If the radius of the octaheral void is `r` and the radius of the atoms in close-packing is `R`, derive relation between `r` and `R`

(a) If the radius of octahedral void is 'r' and the radius of the atoms in close packing is 'R' what is the relation between 'r' and 'R' ? (b) A metal crystallises in body centred cubic structure. If 'a' is the edge length of its unit cell, 'r' is the radius of the sphere, what is the relation between 'r' and 'a' ?

If the radius of the circle is r then find the area of circle?

If the radius of the first Bohr orbit is r, what would be the radius of the second ?

If the radius of 2nd Bohr orbit of H-atom is r_2 the radius of third Bohr orbit of H-atom?

Let ABC be an isosceles triangle with base BC. If r is the radius of the circle inscribsed in DeltaABC and r_(1) is the radius of the circle ecribed opposite to the angle A, then the product r_(1) r can be equal to (where R is the radius of the circumcircle of DeltaABC )

What do you understand by an octahedral void in a close-packed crystal structure? What is the relation between the number of octahedral voids and the number of packed particles in a close-packed structure of particles?

What do you understand by a tetrahedral void in a close-packed structure of a crystal? What is the relation between the number of tetrahedral voids and the number of packed particles in a close-packed structure of particles?

IF three resistances are connected in parallel and the relation between then is R_1 gt R_2 gt R_3 , then the relation between the currents flowing through them is

Assertion(A) : Total number of octahedral voids present in unit cell of cubic close packing including the one that is present at the body centre, is four. Reason ( R) : Besides the body centre there is one octahedral void present at the centre of each of the six faces of the unit cell and each of which is shared between two adjacent unit cells.