Read the following statements carefully Y: The resistivity of semiconductor decreases with increase of temperature Z: In a conducting solid, the rate of collisions between free electrons and ions increases with increase of temperature. Select the correct statement(s) from the
following

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Y is false but Z is true

Y is true but Z is false

Both Y and Z are true

Y is true and Z is the correct reason for Y

answer is C.

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Detailed Solution

Resistivity of conductors increases with increase in temperature because rate of collisions between free electrons and ions increases with increase of temperature as amplitude of oscillation of ionic cores increases . However, the resistivity of semiconductors decreases with increase in temperature, because more and more covalent bonds are broken at higher temperatures.

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