Select the correct statement.

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(C) $1$. $A$ photodiode is operated in reverse bias to detect optical signals. Thus,option $A$ is incorrect.$2$. An $LED$ (Light Emitting Diode) works

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In solar cell,$GaAs$ is preferred over $Si$.

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(C) $1$. $A$ photodiode is operated in reverse bias to detect optical signals. Thus,option $A$ is incorrect.$2$. An $LED$ (Light Emitting Diode) works in forward bias to emit light. Thus,option $B$ is incorrect.$3$. $GaAs$ (Gallium Arsenide) has a band gap of approximately $1.5 \ eV$,which is ideal for solar energy conversion compared to $Si$ $(1.1 \ eV)$. It also has a higher absorption coefficient. Thus,option $C$ is correct.$4$. $A$ Zener diode is heavily doped to allow for a sharp breakdown voltage. Thus,option $D$ is incorrect.

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