If $Cu$ (Copper) and $Ge$ (Germanium) are cooled to $70 \ K$,then:

What is the relationship between the number density of free electrons $(n)$ and temperature $(T)$ in a semiconductor?

For a germanium crystal,the forbidden energy gap in joules is:

Which graph shows correctly the temperature $(T)$ dependence of resistivity $(\varrho)$ of a semiconductor?

Resistivity of a semiconductor depends on

This question has Statement $1$ and Statement $2$. Of the four choices given after the Statements,choose the one that best describes the two Statements.
Statement $1$ : $A$ pure semiconductor has a negative temperature coefficient of resistance.
Statement $2$ : On raising the temperature,more charge carriers are released into the conduction band.