The number of electrons excited into the conduction band from valence band (with ΔE = forbidden energy gap and k = Boltzmann’s constant) is proportional to

\(\exp \left( { - \frac{{2{\rm{\Delta }}E}}{{kT}}} \right)\)

\(\exp \left( {\frac{{{\rm{\Delta }}E}}{{kT}}} \right)\)

\(\exp \left( {\frac{{2{\rm{\Delta }}E}}{{kT}}} \right)\)

\(\exp \left( { - \frac{{{\rm{\Delta }}E}}{{kT}}} \right)\)

The number of electrons excited into the conduction band from valence

1.	The number of electrons excited into the conduction band from valence band (with ΔE = forbidden energy gap and k = Boltzmann’s constant) is proportional to
A.	\(\exp \left( {\frac{{{\rm{\Delta }}E}}{{kT}}} \right)\)
B.	\(\exp \left( {\frac{{2{\rm{\Delta }}E}}{{kT}}} \right)\)
C.	\(\exp \left( { - \frac{{{\rm{\Delta }}E}}{{kT}}} \right)\)
D.	\(\exp \left( { - \frac{{2{\rm{\Delta }}E}}{{kT}}} \right)\)
Answer» D. \(\exp \left( { - \frac{{2{\rm{\Delta }}E}}{{kT}}} \right)\)