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At room temperature, a P-type semiconduc...

At room temperature, a `P`-type semiconductors has

A

Large number of holes and few electrons

B

Large number of free electrons and few holes

C

Equal number of free electrons and holes

D

No electrons or holes

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The correct Answer is:
A
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A pure semiconductor germanium or silicon, free of every impurity is called intrinsic semiconductor. A room temperature, a pure semiconductor has a very small number of current carriers (electrons and holes). Hence, its conductivity is low. When the impurity atoms of valence five or three are doped in a pure semiconductor, we get repectively n-type ot p-type extrinsic semiconductor. In case of a doped semiconductor. n_(e)n_(h)=n_(i)^(2) , where n_(e) and n_(h) are the number density of electrons and holes respectively and n_(i) is the number density of intrinsic charge carriers in a pure semiconductor. The conductivity of extrinsic semiconductor is much higher than that of intrinsic semiconductor. (i) Name two materials to be doped in pure semiconductor of silicon to get p-type semiconductor n-type semiconductor. (ii) What do you learn from the above study?

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ERRORLESS -ELECTRONICS-Selv Evaluation Test
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  2. In a pure silicon (n(i)=10^(16)//m^(3)) crystal at 300K, 10^(21) atoms...

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  3. In the Boolean algebra bar(A).bar(B) equals is :-

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  4. In the given circuit as shown the two input waveform A and B are appli...

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  5. Two identical capacitors A and B are charged to the same potential V a...

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  6. In transistor, forward bias is always smaller than the reverse bias. T...

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  7. In NPN transistor, if doping in base region is increased then collecto...

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  8. In the following circuit I(1) and I(2) are respectively

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  9. In space charge limited region, the plate current in a diode is 10 mA ...

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  10. A triode has a plate resistance of 10 k Omega and amplification factor...

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  11. Pure sodium (Na) is a good conductor of electricity because the 3s and...

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  12. Would there be any advantage to adding n-type or p-type impurities to ...

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  13. In the following common emitter circuit if beta=100, V(CE)=7 V, V(BE)=...

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  14. When a battery is connected to a P-type semiconductor with a metallic ...

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  15. Is the ionisation energy of an isolated free atom different from the i...

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  16. In the following circuit, a voltmeter V is connected across a lamp L. ...

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  17. For given electric voltage signal dc value is

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  18. When a silicon PN junction is in forwards biased condition with series...

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  19. In the following circuit the equivalent resistance between A and B is

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  20. In the following circuit of PN junction diodes D(1),D(2) and D(3) are ...

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  21. In circuit in following figure the value of Y is-

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