Questions
Match the type of unit cell given in Column I with the features given in Column II.
Column I | Column I | ||
A. | Primitive cubic unit cell | 1. | Each of the three perpendicular edges compulsorily have the different edge length,i.e |
B. | Body centred cubic unit cell | 2. | Number of atoms per unit cell is one. |
C. | Face centred cubic unit cell | 3. | Each of the three perpendicular edges compulsorily have the same edge length,i.e. |
D. | End centred orthorhombic unit cell | 4. | In addition to the contribution from the corner atoms the number of atoms present in a unit cell is one. |
5. | In addition to the contribution from the corner atoms the number of atoms present in a unit cell is three. |
detailed solution
Correct option is B
A. →(2,3) B. →(3,4) C. →(3,5) D. →(1,4)A. For primitive unit cell, a = b = c Total number of atoms per unit cell = 1/8 x 8 = 1 Here, 1/8 is due to contribution of each atom present at corner.B. For body centred cubic unit cell, a = b = c This lattice contain atoms at corner as well as body centre. Contribution due to atoms at corn€r = 1/ 8 x 8 = 1 Contribution Due to atoms at body centre = 1C. For face centred unit cell, a = b = c Total constituent ions per unit cell present at corners =18×8=1 Total constituent ions per unit cell present at face centre =12×6=3D.For end centered orthorhombic unit cell,a≠b≠c Total contribution of atoms present at corner =18×8=1 Total contribution of atoms present at end centre =12×2=1Hence, other than corner it contain total one atom per unit cell.Similar Questions
Match the following columns.
Column I | Column II | ||
A. | Simple cubic and face centred cubic | p. | Have these cell parameters |
B. | Cubic and rhombohedral | q. | Are two crystal systems. |
C. | Cubic and tetragonal | r. | Have only two crystallographic angles of 90o. |
D. | Hexagonal and monoclinic | s. | Belong to same crystal system. |
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