An $LED$ is a $p-n$ junction diode which is

Identify the devices which work on solar energy.
$(a)$ Photodiode
$(b)$ Photovoltaic cell
$(c)$ $LED$
$(d)$ Photo-thermal devices

The given graph represents $V-I$ characteristic for a semiconductor device. Which of the following statements is correct?

Consider the following statements $A$ and $B$ and identify the correct answer:
$A$. For a solar-cell,the $I-V$ characteristics lies in the $IV$ quadrant of the given graph.
$B$. In a reverse biased $pn$ junction diode,the current measured in $(\mu A)$ is due to majority charge carriers.

For $LED$s to emit light in the visible region of the electromagnetic spectrum,they should have an energy band gap in the range of:

The schematic symbol of a light emitting diode $(LED)$ is: