Question

What is the edge length of a BCC unit cell?

Hint:

In a BCC unit cell, edge length is derived based on the body diagonal containing 2 atomic radii.

Answer 1

For a BCC unit cell, the relation between edge length (\( a \)) and radius (\( r \)) of the atom is: \[ a = \frac{4r}{\sqrt{3}} \] This relation is derived from the geometry of the BCC unit cell.
Conclusion: Edge length is \( \frac{4r}{\sqrt{3}} \).