$(4$ points$)$ For the exponential model of diode behavior, the current flowing through a diode $$ is very nearly equal to$,=$ where $$ is the saturation current, $$ is the voltage across the diode and $$ is the thermal voltage of the p$-$n junction. The voltage across the diode was measured for five diodes when $1$mA of current was flowing through it$,=1$mA $,=0\mathrm{.}610$V $(1$N$4148$ Silicon Signal Diode$)=1$mA $,=0\mathrm{.}2830$V $(1$N$60$P Germanium Diode$)=1$mA $,=0\mathrm{.}3476$V $(1$N$34$ Germanium Diode$)=1$mA $,=0\mathrm{.}1971$V $(1$N$5819$ Schottky Barrier Diode$)=1$mA $,=1\mathrm{.}643$V $($Kingbright WP$383$SRDT red LED$)$