A piece of copper and another of germanium are cooled from room temperature to 100 K. What will happen to their conductivities? Explain.

A strip of copper another of germanium are cooled from room temperature to 80 K. The resistance of

A piece of germanium and another of copper are stated to experience a rise in temperature. The resistance of

Pragya tested the solubility of three different substances at different tem¬ peratures and collected the data as given below (results are given in the following table, as grams of substance dissolved in 100 grams of water to form a saturated solution).Pragya makes a saturated solution of potassium chloride in water at 353 K and leaves the solution tocool atroom temperature. What would she observe asthesolution cools ? Explain

In an intrinsic semiconductor the energy gap E_g is 1.2eV . Its hole mobility is much smaller than electron mobility and independent of temperature. What is the ratio between conductivity at 600K and that at 300K? Assume that the temperature dependence of intrinsic carrier concentration ni is given by n_i= n_0 exp((E_g)/(2k_BT)) where n_0 is constant.

What is the effect of rise in temperature on the conductivity of copper and silicon ?