Advertisements
Advertisements
प्रश्न
Pieces of copper and of silicon are initially at room temperature. Both are heated to temperature T. The conductivity of ______.
विकल्प
both increases.
both decreases.
copper increases and silicon decreases.
copper decreases and silicon increases.
Advertisements
उत्तर
Pieces of copper and of silicon are initially at room temperature. Both are heated to temperature T. The conductivity of copper decreases and silicon increases.
Explanation:
The resistance of copper wire increases with temperature, which causes a drop in conductivity, while the resistance of silicon wire reduces with temperature, which causes an increase in conductivity.
संबंधित प्रश्न
In a p-type semiconductor, the acceptor impurity produces an energy level ______
In n-type semiconductor, the fifth electron ______.
In p-type semiconductor, the dopant is ______.
In p-type semiconductor, ______.
The electron and hole concentration in a semiconductor in thermal equilibrium is given by ______.
State how a p-type semiconductor will be obtained from a pure crystal of a semiconductor.
Sn, C, and Si, Ge are all group XIV elements. Yet, Sn is a conductor, C is an insulator while Si and Ge are semiconductors. Why?
Suppose a ‘n’-type wafer is created by doping Si crystal having 5 × 1028 atoms/m3 with 1 ppm concentration of As. On the surface 200 ppm Boron is added to create ‘P’ region in this wafer. Considering n i = 1.5 × 1016 m–3, (i) Calculate the densities of the charge carriers in the n and p regions. (ii) Comment which charge carriers would contribute largely for the reverse saturation current when diode is reverse biased.
Name the extrinsic semiconductors formed when pure germanium is doped with a Pentavalent impurity. Draw the energy band diagram of extrinsic semiconductors so formed.
- Statement I: By doping silicon semiconductor with pentavalent material, the electrons density increases.
- Statement II: The n-type semiconductor has net negative charge. In the light of the above statements, choose the most appropriate answer from the options given below:
