In a $p$-type semiconductor,

Indium impurity is added to a sample of $Si$ to prepare a $p$-type semiconductor. In this semiconductor,one atom of indium is added per $5 \times 10^7$ atoms of $Si$. The atomic density of the $Si$ sample is $5 \times 10^{28} \text{ atoms/m}^3$. How many acceptor atoms will be present in a $1 \text{ cm}^3$ cube of silicon?

When a small amount of antimony impurity is added to a germanium crystal,what happens?

The semiconductors are generally

When the temperature of a semiconductor increases,then:

$A$ transistor is a/an