Q104
General SciencePhysics
With increase in temperature the resistance of a pure semiconductor
- a.first increases and then decreases.
- b.remains the same.
- c.increases.
- d.decreases.
Answer: (D) decreases.
In a pure (intrinsic) semiconductor, as temperature increases, more electrons gain enough thermal energy to jump from the valence band to the conduction band, increasing the number of charge carriers. This increase in carriers reduces the resistance — so resistance decreases with increasing temperature, unlike metals.