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Packing Fraction and Efficiency

The correct o...

Question

The correct order of the packing efficiency in different types of nuit cells is ............

(a) fcc < bcc < simple cubic (b) fcc > bcc > simple cubic

(c) fcc < bcc > simple cubic (d) fcc < bcc > simple cubic

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Solution

Answer: (b)

Packing efficiency in different types of nuit cells can be tabulated as

$\begin{matrix} U n i t c e l l & P a c k i n g e f f i c i e n c y f c c & 74 % b c c & 68 % S i m p l e c u b i c & 52 % \end{matrix}$

Hence, correct oreder is $f c c (74 %) > b c c (68 %) > s i m p l e c u b i c (52 %)$

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