Question

What is the relation between r and R in fcc, where r is the radius of octahedederal void and R is the radius of atom in fcc: a) r =R(√3-1) b) r= R(√2-1) c) r= R(√5-1) d )none

Answer 1

Answer:

Remember that a face-centered unit cell has an atom in the middle of each face of the cube. The square represents one face of a face-centered cube:

Applying Pythagoras theorem,

a2+a2=(r+2r+r)2

⇒2a=4r

Explanation:

please mark as brainlist