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Semiconductor Electronics question

2008 · Q144
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Semiconductor Electronics question

2008 · Q144

NEETPhysicsSemiconductor ElectronicsMCQ+4 / −1
If the lattice parameter for a crystalline structure is 3.6 A∘\mathop A\limits^ \circA∘​, then the atomic radius in fcc crystal is
  1. A
    2.92 A∘\mathop A\limits^ \circA∘​
  2. B
    1.27 A∘\mathop A\limits^ \circA∘​
  3. C
    1.81 A∘\mathop A\limits^ \circA∘​
  4. D
    2.10 A∘\mathop A\limits^ \circA∘​
View written solutionFree

Correct answer: B

The atomic radius in a f.c.c. crystal is = a22{a \over {2\sqrt 2 }}22​a​

∴\therefore∴ Atomic radius = 3.622{{3.6} \over {2\sqrt 2 }}22​3.6​ = 1.27 A∘\mathop A\limits^ \circ A∘​

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