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What is the packing efficiency of a two dimensional square unit cell?
Ans-78.54%
how??
in 2 dimensional.....a unit cell square contains 4 circles each having 1/4 contribution to the unit cell(we are talking about circle bcoz it is the case of 2-D not 3-D)....so effective no of circle will be 1 and area of circle is πr2 ....and 2r=a where a is the side of unit square cell....now use packing efficiency formula and u will get the answer..
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