Question

The rasistivity of the metal increases with increase in temperature because
(a) The concentration of electrons in the condector decreases
(b) The concentration of electrons in the condector increases
(c) The average distance between the metal ions increases
(d) The speed of the electrons in the metal decreases​

Answer 1

Answer:

If the metal is heated as a result of heating, the space between atoms increases because of expansion. This increases the time to travel the distance between atoms. During this time the electrons have more collisions with other atoms photon etc. Because of it drift velocity reduces and hence conductivity reduces. Therefore, increases resistivity

Answer 2

Answer:

None of the above

Explanation:

Actual answer is that the Kinetic energy of metal molecules increases and the vibrate with more amplitude. This causes more collisions and hence, higher resistance.

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