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4. (a) Explain the concept of (i) intrinsic, (ii) n-type, and (iii) p-type semiconductors with the aid of bond diagrams and band diagrams.
(b) What is a hole? Using a mathematical derivation to show that the holes behave like positive charges.
(c) Explain with the aid of Fermi-Dirac distribution function that at 0° K, all the energy states in the valence band of silicon are filled and all the energy states in the conduction band are empty.
(d) Why it is necessary to use effective mass instead of real mass for electrons in the analysis of semiconductor materials and mention why different effective masses are to be used for different types of semiconductors,
(e) Explain (a) bonding orbital and (b) anti-bonding orbital.
What is difference between aluminium and beryllium?
Thermodynamic properties: Salts dissolve producing both cations and anions. It means that it is impossible to measure thermodynamic data for individual ion type. The solvation
Number of electron does species have The H2 2- ion can be conceived to result from the combination of two hydride ions (H-). This species have four electrons; two occupy the b
Homolysis bond fission or Homolytic (i) In homolysis bond, the covalent bond is broken in such a way that every resulting species gets its own electron. This is apt to the crea
explain why Ni(co)4 is known while Ca(co)4 is not known
electron affinity of nitrogen is positive but of phosphorus it is negative why I that
nitration of give amines give ortho para and not meta isomer?
Solid Nacl is a bad conductor of electricity since: (1) In solid Nacl there are no ions (2) Nacl Solid is covalent (3) In solid Nacl there is no motion of ions
Q. How do you determine the oxidizing or reducing agent? Ans. A substance that oxidizes another substance is called an oxidizing agent. One that reduces another substance
In hydrogen spectrum the different lines of Lyman series are present is : (1 )UV field (2) IR field (3) Visible field (4) Far IR field Ans: UV field
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