For a transistor amplifier in common emitter configuration for load impedance of $$1k\,\Omega $$ $$\left( {{h_{fe}} = 50} \right.$$ and $$\left. {{h_{oe}} = 25} \right)$$ the current gain is

The difference in the variation of resistance with temperature in a metal and a semiconductor arises essentially due to the difference in the

In the middle of the depletion layer of a reverse- biased $$p$$-$$n$$ junction, the

A strip of copper and another of germanium are cooled from room temperature to $$80K.$$ The resistance of