Platinum and silicon are heated up to $250^{\circ} \mathrm{C}$ and after that cooled. In the process

Question

Platinum and silicon are heated up to $250^{\circ} \mathrm{C}$ and after that cooled. In the process of cooling

Professor PC Thomas Classes · Answer

Platinum is a metal (resistance decreases on cooling) and Silicon is a semiconductor (resistance increases on cooling).