13. The wavelength of K a (X-ray line) of tungsten is 210 Å. If the atomic numbers
of tungsten and copper are, respectively, 74 and 29, the wavelength of copper is:
(a) 1427 Å
(b) 1527 Å
(c) 1627 Å
(d) 1727 Å
14. The wavelengths of K a (X-ray lines) of iron and platinum are 1.93 Å and
0.19 Å, respectively. The wavelengths of K a lines for tin is:
(a) 0.4 Å
(b) 0.5 Å
(c) 0.6 Å
(d) 0.7 Å
15. The wavelengths of K a (X-ray lines) of iron and platinum are 1.93 Å and
0.19 Å, respectively. The wavelengths of K a lines for barium is:
(a) 0.17 Å
(b) 0.27 Å
(c) 0.37 Å
(d) 0.47 Å
16. The atomic number of the element which has K a (X-ray line) of wavelength
0.7185 Å is:
(a) 39
(b) 40
(c) 41
(d) 42
17. The wavelengths of K a line for copper (Z = 29) is:
(a) 1.22 Å
(b) 2.22 Å
(c) 3.22 Å
(d) 4.22 Å
18. The wavelengths of K b line for copper (Z = 29) is:
(a) 0.45 Å
(b) 1.45 Å
(c) 2.45 Å
(d) 3.45 Å
290
7 Diffraction of Waves and Particles by Crystal