Diode is used as a/an

Diode is used as an a

What kind of diode is used as a photo detector?

What is rectification and rectifier ? Why p-n junction diode is used as a rectifier?

Draw the circuit diagram where a zener diode is used as a direct voltage regulator

Assertion (A): Zener diode is used as a voltage regulator. Reason (R ): Zener diode operated in reverse biased condition.

What kind of diode is used as a voltage regulator? .draw the v-i characteristic curve for this diode.