What is the difference between ferromagnetic and ferrimagnetic substances?
In ferromagnetic materials, neighboring dipoles tend to line up in the same direction, whereas in ferrimagnetic materials, neighboring dipoles tend to line up in opposing directions.
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In an alloy of gold and cadmium, gold crystallizes in cubic structure occupying the corners only and cadmium fits into the face centre voids. What is quantitative composition of the alloy?
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What is the difference between glass and quartz, though both contain SiO44– units?
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What is the effect of Frenkel defect on electrical conductivity of the solid?
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Which solid is likely to be the best material for converting sunlight into electricity?
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Long Answer Type
What is a semiconductor? Describe two main types of semiconductors, giving examples and their distinctive features.
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Short Answer Type
Why does Frenkel defect not change the density of AgCl crystal?
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What other element may be added to silicon to make electrons available for the conduction of electric current?
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Long Answer Type
Assign reasons the following: (i) Phosphorus doped silicon is a semi-conductor. (ii) Schottky defect lowers the density of a solid. (iii) Some of the very old glass objects appear slightly milky instead of being transparent.
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Short Answer Type
Which ‘point defect’ lowers the density of ionic crystals?