Rankers Physics

P-N Junction Diode and its applications: Practice Problem & Solution

Choose the only false statement from the following (2005)
In conductors, the valence and conduction bands overlap
Substances with energy gap of the order of 10 eV are insulators
The resistivity of a semiconductor increases with increase in temperature
The conductivity of a semiconductor increases with increase in temperature

Short Solution (Best for NEET):

To solve this problem, we apply the core principles of P-N Junction Diode and its applications. Understanding the underlying formula is key to arriving at the correct answer below:

In semiconductors, as temperature increases, more electrons acquire enough thermal energy to jump to the conduction band. This increases conductivity and decreases resistivity. Therefore, the statement that resistivity increases with temperature is false.

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