Semiconductors Questions

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

If in a p-n junction diode, a square input signal of $10\text{V}$ is applied as shown
, then the output signal across a load resistance $R_L$ (connected in series with the diode) will be:

Carbon, silicon and germanium have four valence electrons each. At room temperature which one of the following statements is most appropriate?

The electrical conductivity of a semiconductor increases when electromagnetic radiation of wavelength shorter than $2480\text{ nm}$ is incident on it. The band gap in ($\text{eV}$) for the semiconductor is:

In a common base amplifier, the phase difference between the input signal voltage and output voltage 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 $80\text{K}$. The resistance of: