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Carbon , silicon and germanium have four...

Carbon , silicon and germanium have four valence electrons each . At room temperature which one of the following statements is most appropriate ?

A

The number of free conduction electrons is negligibly small in all the three.

B

The number of free electrons for conduction is negligibly small in all the three.

C

The number of free electrons for conduction is significant only in Si and Ge but small in all the three.

D

The number of free conduction electrons is significant in C But small in Si and Ge

Text Solution

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The correct Answer is:
C
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NARAYNA-SEMICONDUCTOR ELECTRONICS-C.U.Q (INTRINSIC AND EXTRINSIC SEMICONDUCTORS)
  1. Carbon silicon and germanium have four valence electrons each. These a...

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  2. Identify the property which is not characteristic for a semiconductor ...

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  3. Carbon , silicon and germanium have four valence electrons each . At r...

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  4. When phosphorus and antimony are mixed in germanium, then

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  5. An electrically neutral semiconductor has

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  6. There is no hole current in conductors because they have

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  7. In the insulators

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  8. In semiconductors the for bidden energy gap between V.B and C.B is of ...

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  9. The level formed due to impurity atom, in the for hidden energy gap, v...

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  10. The bond in semiconductors is

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  11. On increasing temperature, the conductivity of pure semiconductors

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  12. The mobility of free electrons is greater then that of free holes beca...

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  13. A semiconductor at 0 K behaves as

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  14. The valency of impurity element for making p-type semiconductors is

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  15. In n-type semiconductors the electron concentration is equal to

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  16. Which of the following statement is not true ?

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  17. p-type semi conduor is

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  18. An n-type semi- conductor is

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  19. An electric field is applied across a semiconductor. Let n be the numb...

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  20. In a n-type semiconductor, the femi energy level lies

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