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A pure semiconductors...

A pure semiconductors

A

extrinsic semiconductor

B

intrinsic semiconductor

C

n type semiconductor

D

p type semiconductor

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The correct Answer is:
B
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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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A pure semiconductor of volume 3.5 xx10^(-7) m^(3) contains 5xx10^(20) conduction electrons per m^(3) determine the number of holes present in it

AAKASH INSTITUTE-Mock Test 39: PHYSICS-Example
  1. Annihilation of 1g of matter theoretically yield energy of the order o...

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  2. The law of conservation of mass is not obeyed by a

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  3. What percentage (approximate) of original radioactive substance left a...

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  4. If the nuclear of radius of O^8 is 2.4 fermi, then radius of Al^27 wou...

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  5. The incorrect feature of nuclear forces among following is

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  6. The t(0.5) of a radioactive element is related to its average life by ...

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  7. The unit of radioactivity decay rate is

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  8. The quark content of proton and neutron are respectively

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  9. If M,mn and mp are masses (in kg) of nucleus Xz^A, neutron and proton ...

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  10. A pure semiconductors

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  11. In a p-n junction diode, holes diffuse from p-region to n- region beca...

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  12. The total number of current careers in intrinsic semiconductor of dime...

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  13. Symbolic representation of photodiode is

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  14. The correct energy band responsible of intrinsic semiconductor at temp...

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  15. The correct statement among the following is/are

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  16. In p-n junction, having depletion layer of thickness 2 ×10^(-6)m the p...

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  17. A N - type semiconductor is

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  18. The current through 2 Omega resistor is(diodes are considered as ideal...

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  19. If ni, ne and nh represents the number of intrinsic charge carrier, nu...

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  20. The cut-in voltage of a germanium diode is approximately equal to

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