Integrated circuit can act as a complete electronic circuit.

In a n-type semiconductors, electrons are majority carriers and holes are minority carriers.

The Boolen expression for the given combination is

output Y = (A + B) · C

So it is clear that Y = 1, when A = 1, B = 0 and C = 1

Distance between nearest atoms in body centred cubic lattice (bcc),

d = $${{\sqrt 3 } \over 2}a$$

Given d = 3.7 $$\mathop A\limits^ \circ $$

$$ \therefore $$ $$a = {{3.7 \times 2} \over {\sqrt 3 }}$$ = 4.3 $$\mathop A\limits^ \circ $$