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With the help of band theory explain (i)...

With the help of band theory explain (i) inability of an insulator to conduct electricity and (ii) the electrical conductivity of a semiconductor.

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CHHAYA PUBLICATION-SOLID STATE-EXERCISE
  1. Why does the electrical conductivity of germanium crystal increase whe...

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  2. Write the differences between crystalline and amorphous solids.

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  3. On the basis of the nature of constituent particles, how are crystalli...

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  4. Between square and hexagonal close packing in two dimensions, which on...

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  5. Define: (i) Cubic close-packed structure (ii) Hexagonal close-packed s...

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  6. Show that 26% of the total volume of a face-centred cubic unit cell re...

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  7. Show that the number of octahedral voids in a ccp or an hcp structure ...

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  8. Explain how the electrical neutrality of an ionic crystal is maintaine...

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  9. Table salt (NaCl), which is essentially white in colour, is found yell...

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  10. ZnO is white in colour, but when it is heated its colour turns yellow....

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  11. Why is ferrous oxide hard to be prepared with ideal stoichiometric com...

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  12. Calculate the number of particles in unit cells of ccp and hcp structu...

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  13. Show with a diagram that a unit cell in a ccp structure has a total of...

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  14. The actual formula derived from the analysis of a sample of ferrous ox...

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  15. Show that if the radius of tetrahedral holes in a ccp or a hcp structu...

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  16. Show that if the radius of octahedral holes be r in a ccp or hcp struc...

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  17. Calculate the packing fraction in a hexagonal close-packed structure w...

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  18. With the help of band theory explain (i) inability of an insulator to ...

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  19. What is an impurity defect? What kind of impurity defect is generated ...

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  20. What is stoichiometric defect? What kind of defects are Schottky and F...

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