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Q.

Read the following statements carefully :
Y : The resistivity of a semi-conductor 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 from the following :

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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

answer is A.

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Detailed Solution

detailed_solution_thumbnail

Vibration of electrons increases with rise in temperature and hence collision between ions and electrons increases with temperature.

Also, in case of semiconductor, resistance decreases with increase in temperature

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Read the following statements carefully :Y : The resistivity of a semi-conductor 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 from the following :