Question

The unit cell of aluminium is a fee with lattice constant , a = 0.405nm. How many unit cells are there in a square aluminium foil 0.005cm thick and side 5cm.​

Answer 1

Answer:

Theoretical density of crystal, ρ=

N

o

a

3

nM

g/cm

3

Given, ρ=2.70 g/cm

3

, a=405×10

−10

cm, M=26

⇒n=

M

ρN

o

×a

3

=

26

2.70×6.022×10

23

×(405)

3

×10

−30

⇒n=4

So, it is a face centered cubic cell.

Hence, Option "B" is the correct answer.

Ans

Explanation:

Hope this helps you