The band gap in a semiconductor is $0.6 eV$. The maximum wavelength of electromagnetic radiation which can create a hole-electron pair in this semiconductor is equal to [Use $hc = 1242 eV-nm$]. (in $nm$)

Two sides of a semiconductor germanium crystal $A$ and $B$ are doped with arsenic and indium respectively. They are connected to a battery as shown in the figure. The correct graph between current and voltage for the arrangement is:

In a semiconductor diode,the reverse biased current is due to the drift of free electrons and holes caused by:

Find the value of $V_{AB}$ in the given circuit.

$A$ device is connected to a supply such that one end is connected to the positive terminal and the other to the negative terminal. If the connections are reversed and no current flows,the device is a .......

The current-voltage relation of a diode is given by $I = (e^{1000V/T} - 1) \; mA$,where the applied voltage $V$ is in volts and the temperature $T$ is in Kelvin. If a student makes an error of $\pm 0.01 \; V$ while measuring the voltage to obtain a current of $5 \; mA$ at $300 \; K$,what will be the error in the value of the current in $mA$?