AIEEE 2004 (Physics) Mock Test

When an npn transistor is used as an amplifier:

For a transistor amplifier in common emitter configuration having load impedance of $1\text{k}\Omega$ ($h_{fe}=50$ and $h_{oe}=25\times 10^{-6}\text{A/V}$), the current gain is:

A piece of copper and another of germanium are cooled from room temperature to $77\text{K}$. The resistance of:

The manifestation of band structure in solids is due to:

When a p-n junction diode is forward biased: