16. The reciprocal lattice to a face-centered cubic (fcc) lattice is:
(a) sc
(b) bcc
(c) fcc
(d) Dc
17. The reciprocal lattice vector G (hkl) to a crystal plane (hkl) is:
(a) parallel
(b) normal
(c) diagonal
(d) tortional
18. In a Brillouin Zone (B-Z) constructed from a given plane hexagonal lattice with
a = b and c ¼ 120
, the shortest distance of the zone face from the center of the
zone is:
(a) 0:155
p
a
À Á
(b) 1:155
p
a
À Á
(c) 2:155
p
a
À Á
(d) 3:155
p
a
À Á
19. In a B-Z constructed from a given simple cubic lattice with a = b = c and
a ¼ b ¼ c ¼ 90
; the six equivalent zone faces from the center of the zone are
at a distance:
(a) p=a
ð
Þ
(b) 2 p=a
ð Þ
(c)
ffiffi ffi
2
p p=a
ð Þ
(d) p=2a
ð
Þ
20. In a B-Z constructed from a given bcc lattice with a = b = c and a ¼ b ¼ c ¼
90
; the twelve equivalent zone faces from the center of the zone are at a
distance:
(a) p=a
ð Þ
(b)
ffiffi ffi
2
p p=a
ð Þ
(c)
ffiffi ffi
3
p p=a
ð Þ
(d) 2 p=a
ð Þ
90
2 Unit Cell Construction