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Semiconductor Electronics question

2009 · Q151
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Semiconductor Electronics question

2009 · Q151

NEETPhysicsSemiconductor ElectronicsMCQ+4 / −1
Sodium has body centred packing. Distance between two nearest atoms is 3.7 A∘\mathop A\limits^ \circA∘​. The lattice parameter is
  1. A
    4.3 A∘\mathop A\limits^ \circA∘​
  2. B
    3.0 A∘\mathop A\limits^ \circA∘​
  3. C
    8.6 A∘\mathop A\limits^ \circA∘​
  4. D
    6.8 A∘\mathop A\limits^ \circA∘​
View written solutionFree

Correct answer: A

Distance between nearest atoms in body centred cubic lattice (bcc),

d = 32a{{\sqrt 3 } \over 2}a23​​a

Given d = 3.7 A∘\mathop A\limits^ \circ A∘​

∴\therefore∴ a=3.7×23a = {{3.7 \times 2} \over {\sqrt 3 }}a=3​3.7×2​ = 4.3 A∘\mathop A\limits^ \circ A∘​

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