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Q.

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

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a

18

b

1

c

12

d

14

answer is B.

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Detailed Solution

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