Question

A photodiode is symbolized by the graphic
A)
B)
C)
D)

Answer 1

-Diode: It is an electrical two-terminal device used to allow the flow of current in only one direction.
-Photodiode: It is an electrical device when exposed to light energy it generates a potential difference or the electrical resistance is changed.

Complete step-by-step solution:
The photodiode is a special type of PN junction electrical device.
The photodiode is also known as the photo sensor.
Photodiode works in reverse biased mode. Photodiode converts light energy into electrical energy.
When light energy falls on the diode, it excites an electron, and creates a mobile electron, and positively charges an electron-hole.
The symbol of the photo sensor is similar to the normal PN junction.
Photodiodes are used for optical communications.
It is also used to measure extremely low light intensities.
The applied reverse bias voltage of the photosensor should be below.
The N-side of the photodiode is connected to the positive terminal of the battery and the P-side of the photo sensor is connected to the negative terminal of the battery.
Photodiode reduces the response when the surface gradually increases.
When light energy falls on the surface of the photodiode, the temperature of the surface of the photodiode increases.

Hence the correct option is $\left( {\text{A}} \right)$ and $\left( {\text{B}} \right)$

Note: In reverse bias, the anode terminal of the photo sensor is connected to the N-type pin and the cathode terminal of the voltage source is connected to the P-type pin.
In reverse bias, the diode behaves like an open switch
A diode is said to be forward-biased if the P-type pin is connected with the anode of a voltage source and the N-type of the diode is connected with the cathode of the source.
In forwarding bias photo sensors, the diode acts like a closed switch.