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Types of Unit Cell

Particle at t...

Question

Particle at the face centre of the unit cell contributes how many part to that unit cell?

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Solution

Contribution of face-centred particle:
A particle at the face-centre is shared by two-unit cells.
So, each particle contributes $\frac{1}{2}$ part to the unit cell.

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Q. A particle at edge centre of a unit cell contributes how much part to that unit cell?

Q. A particle at body-centre of the unit cell is shared by how many other unit cells?

Q. What is the contribution of particles at alternate face centre in a cubic unit cell

In a face centred cubic cell, an atom at the face contributes to the unit cell

[Karnataka (Engg./Med.) 2000; AFMC 2001]

Q. How many of the following statement(s) is/are incorrect regarding tetrahedral voids in fcc lattice?
a) Each body diagonals contains 2 tetrahedral voids
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\frac{1}{4^{t h}}

part to a unit cell
c) One tetrahedral void is present at the body centre of unit cell
d) Each face diagonals contains 2 tetrahedral voids

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