Current Electricity and Electrical InstrumentHard

Question

Read the following statement 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

Options

A.Y is true but Z is false
B.Y is false but Z is true
C.Both Y and Z are true
D.Y is true and Z is the correct reason for Y

Solution

Resistivity of condcutors increases with increase in temperature because rate of collisions between free electrons and ions increases with increase of temperature. However, the resistivity of semiconductors decrease with increase in temperature, because more and more covalent bonds are broken at higher temperature.

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