A) generally, the crystals are expected to expand by temperature. what are the reasons for this? in which cases, it can be expected to decrease the size of the objects whose temperature increases.
b) explain the reasons for the formation of the forbidden band.
c) write down the reason why good conductors are used in mirror construction.
d) show sdia = sbas à sfcc for the structure factors; sdia, sbas, sfcc which are diamond crystal, the base of the diamond, and for fcc respectfully.
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