Consider the bcc unit cells of the solids 1 and 2 with the position of atoms as shown below. The radius of atoms B is twice that of atom A. The unit cell edge length is 50% more in solid 2 than in 1. What is the approximate packing efficiency in solid 2?
45%
75%
90%
65%
length of body diagonal =
=
=
= 91.27%=90%
45%
Option 2)75%
Option 3)90%
Option 4)65%
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