(Answered) 1we know that face centered lattice in cubic and

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1. We know that face centered lattice in cubic and orthorhombic (FCC & FCO) system are listed in Bravais lattice system but face centered tetragonal (FCT) is not listed, why?

2. Draw the plane with miller indices (122) in the unit cell of cubic lattice having lattice parameter ‘a'. Find its distances from the parallel plane through the origin.

3. Find the miler indices of plane which makes intercept of 2 on a-axis and 3 on b-axis and is parallel to c-axis.

4. Find the miller indices of plan that makes intercepts on a, b and c axis equal to 4 Å, 2 Å and 3 Å in the orthorhombic crystal with a:b:c = 2:4:3.

5. The Bragg angle for reflection from (110) plane is 20.2 degree. Find the wavelength of X-ray. (lattice parameter of the crystal is 3.15 Å)

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