A metal crystallizes in `bcc` lattice. The percent fraction of edge length not covered by atom is

Options

A. 0.114
B. 0.104
C. 0.134
D. 0.124

Explanation

(c ) Edge length not covered by atom=-2r
"["therefore "For" bcc, r+(sqrt3)/(4)a"]"
`a=-2xx(sqrt3)/(4)a=a[(2-sqr3)/(2)]`
`therefore "% of fraction not covered"=(a[[2-sqrt3)/(2)]xx100)/(a)`