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  4. The packing efficiency of the two-dimensional square unit cell shown below is

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Q. The packing efficiency of the two-dimensional square unit cell shown below isChemistry Question Image

JEE AdvancedJEE Advanced 2010

Solution:

image
$a =(2 \sqrt{2} r )$
$P.F. =\frac{2 \times \pi r ^{2}}{(2 \sqrt{2} r )^{2}}=\frac{2 \pi r ^{2}}{8 r ^{2}}=\frac{\pi}{4}$