CBSE Class 12 Physics 2023 Outside Delhi Set 1 Paper

Question : 14

Total: 35

Pieces of copper and of silicon are initially at room temperature. Both are heated to temperature T. The conductivity of

both increases.
both decreases.
copper increases and silicon decreases.
copper decreases and silicon increases.

Solution: 👈: Video Solution

Copper is a conductor. As the temperature of copper increases the ions vibrate vigorously. So, the number of collisions between the free electrons and the ions increases. Hence, the resistance increases and conductivity decreases.
Silicon is a semiconductor. As the temperature increases, more covalent bonds rupture generating more free charge carriers. Hence, the resistance decreases and conductivity increases.

Go to Question:

Prev Question

Next Question