Question

the edge length of the unit cells terms of the radius of sphere constituting fcc, bcc and simple cubic unit cells are respectively
a )2 √2r, 4r/ √3, 2r.
b) 4r/√3 ,2√2r ,2r.
c) 2r,2√2r, 4r/√3.
d) 2r,4r/√3,2√2r .
please answer .​

Answer 1

Answer:

A is the right answer.

Explanation:

Since,a=4r/√2 for fcc or hcp or ccp so,by rationalozing it comes out to be 2√2

For bcc a=4r/√3

and for simple cubic,since radius is simply half of a i.e;r=a/2,hence a itself comes out to be 2r