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The valency of the impurity atom added t...

The valency of the impurity atom added to make germanium crystal into n-type semi-conductor have ….

A

6

B

5

C

4

D

3

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The correct Answer is:
B
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What amount of inpurity of atomic density in added toform N-type semiconductor in Ge semiconductor of conductivity sigma is 5Omega^(-1)cm^(-1) Mobility of electron in N-type semiconductor is 3900 cm^(2)V^(-1)s^(-1) . Ignore conductivity due to hole. (e=1.6xx10^(-19)C)

……as a impurity, when added in Si or Ge P- type semiconductor is obtained.

A hydrogen like atom (atomic number Z) is in a higher excited state of quantum number n. The excited atom can make a transition to the first excited state by successively emitting two photons of energy 10.2 eV and 17.0 eV, respectively. Alternatively, the atom from the same excited state can make a transition to the second excited state by successively emitting two photons of energies 4.25 eV and 5.95 eV, respectively Determine the values of n and Z. (lonization energy of H-atom = 13.6 eV)

To a germanium sample, traces of galium are added as an impurity. The resultant sample would behave like ……..

KUMAR PRAKASHAN-SEMICONDUCTOR ELECTRONICS : MATERIALS, DEVICES AND SIMPLE CIRCUITS -Section-D : Multiple Choice Questions (MCQs) (MCQs asked in Competitive Exams)
  1. A circular loop enters a uniform magnetic field as shown in the figure...

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  2. The rms value of a.c. signal in halfwave rectifier is ……

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  3. The valency of the impurity atom added to make germanium crystal into ...

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  4. To a germanium sample, traces of galium are added as an impurity. The ...

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  5. When the semiconductor is heated ……..

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  6. Which logic gate is represented by the following logic gates?

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  7. A Ge specimen is doped with Al. The concentration of acceptor atoms is...

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  8. Which of the following logic gate is an universal gate?

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  9. Write the truth table for circuit given in figure below consisting of ...

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  10. A light emitting diode (LED) has a voltage drop of 2 volt across it an...

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  11. In half wave rectification, what is the output frequency if the input ...

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  12. The forbidden gap in the energy bonds of silicons is ……

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  13. Which among the following is applicable to tapetum? (A) Protective la...

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  14. When the inputs of a two input logic gate are 0 and 0, the output is 1...

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  15. Which logic gate is represented by the following logic gates?

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  16. The direction of the electric field in p-n junction diode is …….

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  17. When the electromagnetic radiation of maximum wavelength of 2480 nm is...

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  18. To create AND gate require ……NAND gate.

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  19. What kind of p-n junction diode does not require any kind of bias?

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  20. The doping of minute quantity of antimony to a silicon crystal makes i...

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