21. A diffraction data of a cubic crystal of an unknown element show peaks at 2h
angles 44.46°, 51.64°, 75.78° and 93.22°. If the wavelength of X-ray used is
1.543 Å, the crystal structure is found to be:
(a) SC
(b) BCC
(c) FCC
(d) DC
22. A diffraction data of a cubic crystal of an unknown element show peaks at 2h
angles 44.46°, 51.64°, 75.78° and 93.22°. If the wavelength of X-ray used is
1.543 Å, the lattice parameter of the element is found to be:
(a) 3.53 Å
(b) 4.53 Å
(c) 5.53 Å
(d) 6.53 Å
23. A diffraction data of a cubic crystal of an unknown element show peaks at 2h
angles 44.46°, 51.64°, 75.78° and 93.22°. If the wavelength of X-ray used is
1.543 Å, the unknown element is found to be:
(a) Iron
(b) Aluminum
(c) Copper
(d) Nickel
24. A diffraction data of a cubic crystal of an unknown element show peaks at 2h
angles 38.60°, 55.71°, 69.70°, 82.55°, 95.00° and 107.67°. If the wavelength of
X-ray used is 1.543 Å, the crystal structure is found to be:
(a) SC
(b) BCC
(c) FCC
(d) DC
25. A diffraction data of a cubic crystal of an unknown element show peaks at 2h
angles 38.60°, 55.71°, 69.70°, 82.55°, 95.00° and 107.67°. If the wavelength of
X-ray used is 1.543 Å, the lattice parameter of the unknown element is found to
be:
(a) 3.30 Å
(b) 4.30 Å
(c) 5.30 Å
(d) 6.30 Å
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9 Determination of Crystal Structure Parameters