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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.
Q. General Characteristics of elements of Group 13? All the elements of Group 13 have similar valence shell electronic configuration of ns 2 np 1 , but the underlying core vari
Describe the principle and working of Mass spectrometry with suitable diagram along with its applications. Definition of Mass Spectrometry Show the principle and working
a. 'Hormones are chemical messengers.' Explain? b. Name the main disease caused due to lack of the vitamin and its source in each of the following: A, B 6 and E.
Streptomycin: It was discovered in the year 1944 by Waksman. Streptomycin is successful against tuberculosis. It is as well used for other general infections such as ears, thro
Q. Consider a system containing only NH 4 Cl(s), NH 3 (g), and HCl(g). Assume that the equilibrium NH 4 Cl(s) ⇔ NH 3 (g), and HCl(g) exists. (a) Suppose you prepare the system b
Q. Uses of Aluminium? Aluminium exhibits useful properties of low density, high thermal and electrical conductivity, and good corrosion resistance with non-toxic nature of the
Which of the following sets of quantum number is not possible: (1) n=3, l=+2, m=0,and s = +1/2 (2) n=3, l=0, m=0,and s = -1/2 (3) n=3, l=0, m=-1,and s = +1/2
Which has highest second ionisation energy? Electronic config of Na(+) is noble gas config. . so its very difficult to remove an electron so it will have very high 2nd ionisati
work is not a state function. Explain
Laboratory safety During your observation of chemistry you will conduct experiments in the laboratory. When working in the lab you are accountable for the safety of yourself and o
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