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Q.

The contribution of particle at the edge centre to a particular unit cell is,

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a

$\frac{1}{2}$

b

$\frac{1}{4}$

c

1

d

$\frac{1}{8}$

answer is B.

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Detailed Solution

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An edge centered is common to four-unit cells.
The contribution from each edge atom is hence, 1/4.
Think about the edge a ceiling near you.
Assume that this is a multistorey apartment.
The room you are in, the room beside you, and two rooms on the floor above you would share that same edge - that is where the number 4 comes from.
So, if an atom is placed with equal parts in all the 4 rooms, the contribution from each room would be 1/4.

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