The active area of a solar cell is $......$ so that the power obtained $......$.

The symbolic representation of a photodiode is:

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: Photodiodes are preferably operated in reverse bias condition for light intensity measurement.
Reason $R$: The current in the forward bias is more than the current in the reverse bias for a $p-n$ junction diode.
In the light of the above statements,choose the correct answer from the options given below:

Which of the following statements is $NOT$ correct in the case of an $LED$?

The following graph represents:

Why are $Si$ and $GaAs$ preferred materials for solar cells?