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why does the electrical conductivity of semiconductors increse with rise in temperature?

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Electric conductivity increases with decrease in temperature.
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Assertion (A) : The electrical conductivity of a semiconductor increases with increase in temperature. Reason (R ) : With increase in temperature, large number of electrons from the valence band can jump to the conduction band.

Statement I : Electrical conductivity of semiconductors increases with rise in temperature. Statement II : There is a small energy gap between conduction band and valence band.

DINESH PUBLICATION-SOLID STATE-ASSIGNMENT
  1. With the help of electron spins, clearly distinguish between Ferromagn...

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  2. What do you understand by paramagnetism and diamagnetism ?

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  3. why does the electrical conductivity of semiconductors increse w...

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  4. How are n-type and p-type semiconductors formed ? Give one example in ...

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  5. What types of semi-conductors will be formed when silicon is doped wit...

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  6. What are piezoelectric crystals ? Give their important uses.

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  7. How will you account for the fact that silicon is an insulator but sil...

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  8. Give one example of 1315 compounds.

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  9. Define the term doping. Pure silicon is an insulator. Silicon doped wi...

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  10. What is the magnetic nature of super-conductors?

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  11. How does the electrical conductivity of super- conductors vary with te...

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  12. What types of crystals show pyroelectricity ?

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  13. What is super conductivity ?

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  14. Give one example of peizoelectric substance.

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  15. FERROMAGNETIC SUBSTANCES

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  16. Explain superconductivity.

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  17. At what temperature range most of the metals becomes superconductors

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  18. Define piezoelectricity.

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  19. How does electrical cocductivity of semi-conductors vary with temperat...

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  20. Name the non-stoichiometric point defect responsible for the colour of...

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