Question

17th one please answer it ​

Answer 1

Answer:

resistivity of a material vary with the temperature as the temperature increases resistance increases of metals because of the motion of electrons random ly

resistivity of semiconductor decreases with the rise of temperature not sure about the semiconductor

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Answer 2

Explanation:

metallic conductor-A metals electrical conductivity increases with decrease in temperature and decreases with increase in temperature. As it cools down, there is no hindrance in the form of thermal excitation, enabling easier flow of carriers, increasing conductivity.

semi conductor-Just like the conductors, the increase in the temperature increases the vibrations of atoms in the semiconductor. However, the vibrating atoms in the semiconductor oppose only few electrons and the remaining large number of electrons flows freely from one place to another place.