Question

The packing efficiency of the two-dimensional square unit cell shown below is :
(a) 39.27%
(b) 68.02%
(c) 74.05%
(d) 78.54%

Answer 1

the answer is

(b) 68.02%

Answer 2

Answer:

Explanation:

4R=√2L

R=1/2√2

% packing efficiency (η) = area of circle/area of square×100

= 2×πR^2/L^2×100

2π(L^2/4*2)/L^2 *100=78.5%

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