1.

The packing efficiencyof the two dimensional square unit cell shown below is

Answer»

0.5025
0.6802
0.7405
0.785

Solution :`4r=Lsqrt(2)` so `L=2sqrt(2)r`
Area of square unit cell `=(2sqrt(2)r)^(2)=8r^(2)`
Area of atoms present in one unit cell

`=PIR^(2)+r((pir^(2))/4)=2pir^(2)`
so packing EFFICIENCY `=(2pir^(2))/(8r^(2))XX100`
`=(pi)/4xx100=78.5%`


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