A metal crystallises in `b.c.c.` lattice. The per cent fraction of edge length not covered by atom is `:`A. `11.4%`B. `12.4%`C. `13.4%`D. `14.4%`

A metal crystallises in `b.c.c.` lattice. The per cent fraction of edg

1.	A metal crystallises in `b.c.c.` lattice. The per cent fraction of edge length not covered by atom is `:`A. `11.4%`B. `12.4%`C. `13.4%`D. `14.4%`
Answer» Correct Answer - c In `b.c.c.,` radius of atom `r=(sqrt(3)a)/(4` Also, edge length of unit cell `=a` `:. ` Edge length not covered by atom `=a-2r` `=a-(sqrt(3))/(2).a` `=a((2-sqrt(3))/(2))` `:. %` fraction not covered `(a((2-sqrt(3))/(2)))/(a)xx100=13.4%`

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A metal crystallises in `b.c.c.` lattice. The per cent fraction of edge length not covered by atom is `:`A. `11.4%`B. `12.4%`C. `13.4%`D. `14.4%`

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