What is the difference between glass and quartz, though both contain SiO44– units?
Both naturally-occurring and artificial quartz crystal contains at least ninety-nine percent silicone dioxide, while cut glass crystal only possesses at most eighty percent silicone dioxide.
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Which solid is likely to be the best material for converting sunlight into electricity?
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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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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?
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What is the difference between ferromagnetic and ferrimagnetic substances?
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Why does Frenkel defect not change the density of AgCl crystal?
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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
What is the effect of Frenkel defect on electrical conductivity of the solid?
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What other element may be added to silicon to make electrons available for the conduction of electric current?
