Calculate the number of unit cells in $1 \ cm^3$ volume of metal if the volume of one unit cell is $3.448 \times 10^{-23} \ cm^3$.
- A$2.5 \times 10^{22}$
- B$3.2 \times 10^{22}$
- C$2.9 \times 10^{22}$
- D$3.7 \times 10^{22}$
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How many space lattices are obtainable from the different crystal systems?
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| $(A)$ Simple cubic and face-centred cubic | $(p)$ have these cell parameters $a=b=c$ and $\alpha=\beta=\gamma=90^{\circ}$ |
| $(B)$ Cubic and rhombohedral | $(q)$ are two crystal systems |
| $(C)$ Cubic and tetragonal | $(r)$ have only two crystallography angles of $90^{\circ}$ |
| $(D)$ Hexagonal and monoclinic | $(s)$ belong to same crystal system |
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