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Q. Copper has face centred cubic lattice with interatomic spacing $2.5\,\mathring{A}$. The value of lattice constant will be about

Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

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Lattice constant is the side of the cubic crystal.
$S =\frac{2.5}{\sqrt{2}} \times 2$
$=3.5\,\mathring{A}$