The Solid State

  • Question 45
    CBSEENCH12005393

    What kind  point defect lowers the density of a crystal?

    Solution
    Schottky defect lowers the density of a crystal.
    Question 46
    CBSEENCH12005394

    What do you mean by ‘point defects' in crystals?

    Solution
    Point defects are caused by missing or misplaced ion or atom in the crystal lattice i.e., deviation from regular arrangement of ions/ particles in the crystal.
    Point defects can be classified into three types : (i) stoichiometric defects (ii) impurity defects and (iii) non-stoichiometric defects.
    Question 47
    CBSEENCH12005395

    Define dislocation in crystals.

    Solution
    crystal defect. Line defects, or dislocations, are lines along which whole rows of atoms in a solid are arranged anomalously. The resulting irregularity in spacing is most severe along a line called the line of dislocation. Line defects can weaken or strengthen solids.
    Question 48
    CBSEENCH12005396

    Explain the term ‘dislocations’ in relation to crystals?

    Solution
    Crystal defect. Line defects, or dislocations, are lines along which whole rows of atoms in a solid are arranged anomalously. The resulting irregularity in spacing is most severe along a line called the line of dislocation. Line defects can weaken or strengthen solids.

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