SEMI CONDUCTOR

(a) Based on the nature of the intermolecular foces, classify solids benzene and silver. (b) AgCl shows frenkel defect while NaCl does not. Give reason. (c) What type of semi-conductor is formed when Ge is doped with Al ?

Define the term doping. Pure silicon is an insulator. Silicon doped with phosphorus is a semiconductor. Silicon doped with gallium is also a semi-conductor. What is difference between the two types of semi-conductors ?

Average and instantaneous current | Drift velocity | Mobility| Current density | Ohm's experimental law | Ohm's Law from drift velocity | Temperature dependence of resistivity for conductors | semi comductors and super conductors | Temperature dependence of resistance

The diagram Fig.12 shown a piece of pure semiconductor S in series with a variable resistor R, and a source of constant voltage V. Would you increase or decrease the value of R to keep the reading of ammeter constant, when semi-conductor S is heated? Give reason.

In the shown figure a current 2i is flowing in a straight conductor and entering along the diameter of the circular loop of similar conductor through the point A. The current is leaving the loop along another similar semi-infinite conductor parallel to the plane of the loop through the point D. what is the magnetic field at the centre of the loop P ?

A semiconductor is known to have an electron concentration of 5xx10^(12) cm^(-3) and a hole concentration 8xx10^(13)cm^(-3) Is the semi-conductor n-type or p-type? What is the resistivity of the sample, if the electron mobility is 23,000 cm^(2) V^(-1)s^(-1) ? Take charge on electron, e=1.6xx10^(-19) C .

Draw a semi-circle with centre O and radius 5cm. Is the diameter that determines the semi- circle,a part of the semi-circle?

A semi-circle of diameter 1 unit sits at the top of a semi-circle of diameter2 units. The shaded region inside the smaller semi-cricle but outside the larger semi-circle a lune. The area of the lune is-