Practice Exam X-ray

1 . Calculate the intensity of a 210 and the 110 diffraction spot for a body centered cubic structure of Pt metal in terms of FPt - the scattering factor for Pt.

2. The following diffraction pattern was obtained when laser light of 660 nm was transmitted through a slide 1.3 m from the paper. The marks on scale of the paper correspond to 13.8 mm. a) What is the miller index of the diffraction spot the arrow indicates? b) What is the intensity of the 10 spot compared to the spot that the arrow is pointed to? c)What are the two dimensions of the unit cell?

3. Pt forms a bcc crystals. If the radius of Pt is 139 pm or 1.39 A; what is the density of Pt?

4. Problem 23.27

5. The crystal unit cell of MgO is a cube 420 pm on an edge. The structure is an interpenetrating face centered cubic or NaCl type structure. What is the density of MgO?