In the energy band diagram of insulators, the band gap and the conduction band are respectively:

The energy gap of silicon is $1.1 \, eV$. At what wavelength will silicon stop absorbing photons? (in $\mathring A$)

$A$ semiconductor wire is connected in an electric circuit in series. If the temperature of the semiconductor increases,then the current will:

Give a classification of semiconductors and write examples of each.

Assertion : The resistivity of a semiconductor increases with temperature.
Reason : The atoms of a semiconductor vibrate with larger amplitude at higher temperatures,thereby increasing its resistivity.

The temperature dependence of resistances of $Cu$ and undoped $Si$ in the temperature range $300-400 \ K$ is best described by: