The band gap of the semiconductor ${\mathrm{GaAs}}_{0.6}{\mathrm{P}}_{0.4}$ is $1.9 \mathrm{eV}$. If this material is used to make a Light Emitting Diode $\left(\mathrm{LED}\right)$, the colour of the emerging light will appear

In the given circuit, The current through battery is

Take the breakdown voltage of the zener diode used in the given circuit as $6 \mathrm{V}$. For the input voltage shown in the figure below, the time variation of the output voltage is: (Graphs drawn are schematic and not to the scale)

In case of a p-n junction diode at high value of reverse bias, the current rises sharply. The value of reverse bias is known as

Two $p$ - $n$ photodiodes are fabricated from semiconductors with band gap of $2.8\mathrm{eV}$ and $2.6\mathrm{eV},$ respectively.

Choose the correct statement from the following.

Two Zener diodes ($A$ and $B$) having breakdown voltages of $6 \mathrm{V}$ and  $4 \mathrm{V}$ respectively, are connected as shown in the circuit below. The output voltage $V_0$ variation with input voltage linearly increasing with time, is given by ($V_{input} = 0 \mathrm{V} \text{at} t = 0$)

A $220 \mathrm{V}$ A.C. supply is connected between points $A$ and $B$ as shown in figure what will be the potential difference $V$ across the capacitor?