Application of Photoelectric Effect Photocell - Photoelectricity - Physics 2

TL;DR

The video explains the application of photoelectric effect in a photo cell, which converts light energy into electric energy.

Transcript

click the bell icon to get latest videos from akira hello friends today we will see application of photoelectric effect and the application is photo cell now we know it is photoelectric cell so there is nothing but light an electric miss electric energy we can say means this photo cell is convert light energy into the electric energy now we will se... Read More

Key Insights

• 🙂 Photo cells are devices that convert light energy into electric energy through the photoelectric effect.
• 🤘 The construction of a photo cell involves a cathode (metal plate) and an anode (platinum rod).
• ⏰ Applications of photo cells include lux meters for measuring light intensity, burglar alarms for detecting intruders, and fire alarms/smoke detectors.
• ⚡ Lux meters work based on the principle that higher light intensity leads to an increased photoelectric current.
• 📷 Burglar alarms use photo cells and infrared light to detect intruders by interrupting the incident radiation on the photo cell.
• 🙂 Photo cells can be used as smoke detectors by detecting the interruption of light due to smoke particles.
• 🖐️ The principle of photoelectric effect plays a crucial role in the functioning of photo cells.

Questions & Answers

Q: How does a photo cell convert light energy into electric energy?

When light of suitable frequency falls on the photo cell's cathode, electrons are emitted according to the photoelectric effect. These electrons move towards the anode, creating an electric current.

Q: What is the construction of a photo cell?

A photo cell consists of a cathode, which is a metal plate, and an anode made of a platinum rod. The cathode is at a negative potential, while the anode is at a positive potential.

Q: What is the principle behind a burglar alarm using a photo cell?

In a burglar alarm, a continuous source of infrared light is incident on the photo cell. If something obstructs the light, the photoelectric current stops, triggering an alarm to indicate the presence of an intruder.

Q: How does a photo cell function as a lux meter?

A lux meter measures the intensity of light. In a photo cell-based lux meter, when the light intensity increases, there is a corresponding increase in the photoelectric current, allowing for the detection of light intensity.

Summary & Key Takeaways

• The video discusses the construction of a photo cell, which consists of a cathode (metal plate) and an anode (platinum rod).

• When light of suitable frequency falls on the cathode, electrons are emitted according to the photoelectric effect, and they move towards the anode.

• Photo cells have various applications such as in lux meters to measure light intensity, burglar alarms to detect intruders, and fire alarms/smoke detectors.