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Question

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

A
12
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B
14
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C
1
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D
18
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Solution

The correct option is B 14

An edge centered is common to four unit cells. The contribution from each edge atom is hence, 1/4. Think about the edge a cieling 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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