The Solid State

Short Answer Type

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What are extrinsic semi-conductor?

An extrinsic semiconductor is an improved intrinsic semiconductor with a small amount of impurities added by a process, known as doping, which alters the electrical properties of the semiconductor and improves its conductivity. Introducing impurities into the semiconductor materials (doping process) can control their conductivity.
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    If three elements A, B and C crystallize in a cubic solid lattic with A atom at the corner, B atoms at cube centre and C atoms at edges then what would be the formula of the solid?
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    Find out the number of atoms per unit cell in a face-centred cubic structure having only single atoms at its lattice points.
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    What is the difference between ccp and fcc lattice?
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    Out of Schottky and Frenkel defect which increases the dielectric constant of crystals?
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    Long Answer Type

    How many lattice points are there in one unit cell of each of the following lattice?
    (a) face centred cubic
    (b) face centred tetragonal
    (c) body centred cubic

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    Short Answer Type

    Name a salt that can be added to AgCl so as to produce cation vacancies.
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    What is Photovoltaic.
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    What percent of space is utilised by spheres in (i) simple cubic, (ii) face-centered cubic, (iii) body-centered cubic structure?
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    What makes alkali metal halides sometimes coloured, which are otherwise colourless?
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