Related Questions

The temperature dependence of the electrical conductivity σ of two intrinsic semiconductors A and B is shown in the figure. If EA and EB are the band gaps of A and B respectively, which one of the following is true?
Solid State Physics mcq question image
For better resistance welding, the metal must have
P. high electrical resistivity and low melting point
Q. high thermal conductivity
R. high electrical resistivity and high melting point
S. low thermal conductivity
Compound semiconductors are also known as direct band gap semiconductors.
The thermal conductivity and the electrical conductivity of a metal at absolute temperature are related as
During electrical desalting of crude oil, the electrical conductivity of a mixture of crude oil and water (which ranges between 3 to 8% water) __________ with increase in the amount of water.
The ratio of thermal & electrical conductivity is same for all the metals at the same temperature; and at around room temperature, this ratio is proportional to (where, T = absolute temperature, °K)
Thermal conductivity based continuous flue gas analyser makes use of varying thermal conductivity of the constituents of flue gases. Which of the following constituents of flue gases has the maximum thermal conductivity?
A cylinder of radius r and made of material of thermal conductivity k 1 is surrounded by a cylindrical shell of inner radius r and outer radius 2r. This outer shell is made of a material of thermal conductivity k 2. Net conductivity would be
For gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally
As temperature increases, the electrical resistivities of pure metals $$\left( {\rho m} \right)$$  and intrinsic semiconductors $$\left( {\rho s} \right)$$  vary as follows