- #1
bael
- 28
- 0
I was wondering why photoelectric cells are evacuated
Borek said:Think how they work.
Borek said:So far so good. Now think about the "travel towards the cathode part".
bael said:is it because the electrons could possibly collide with the oxygen and other electronegative gases, ionizing them and thus giving a smaller reading on the current meter?
A photoelectric cell, also known as a photocell, is an electronic device that converts light energy into electrical energy. It consists of a thin metal plate or semiconductor material that is exposed to light and connected to a circuit.
When light hits the metal plate or semiconductor material, it causes electrons to be emitted from the surface. These electrons are then collected by a positively charged electrode, creating a flow of electrical current. The intensity of the light affects the number of electrons emitted, thus controlling the amount of current produced.
Photoelectric cells are often placed in evacuated tubes to reduce the interference of air molecules. In a vacuum, there are fewer air molecules to scatter or absorb the light, resulting in a more accurate measurement of the light intensity.
Photoelectric cells have a wide range of applications, including light meters, solar panels, and even barcode scanners. They are also used in automatic doors, burglar alarms, and traffic sensors.
One of the main advantages of photoelectric cells is their ability to convert light energy into electrical energy with high efficiency. They are also highly durable and have a long lifespan, making them a cost-effective option. Additionally, they do not require any external power source, making them a sustainable and environmentally friendly choice.