Question

34.
Metallic silver crystallizes in face central
cubic lattice structure with a unit cell of
length 40 nm. The first order diffraction
angle of X-ray beam from (2,1,0) plane
of silver is 30°. The wavelength of X-ray
used is close to
ndroane
(a)
11 nm
(b) 18 nm
(c) 25 nm
(d) 32 nm
CS​

Answer 1

Answer:

just use n* lamda = 2d sin theta

d = a/✓(h^2 + k^2 + l^2 )

n = 1 and h = 2 k = 1 = l=0

d = 40/ ✓5

• lambda = 2* 40/✓5 * 1/2 = 18 nm