Photoelectric effect by Einstein | Work Function | Photocell | Part 2
Channel: Physics Buddies
Date: 07/02/2023

We will see that;
The photoelectric effect is a phenomenon where electrons are emitted from a metal surface when light shines on it. In 1905, Albert Einstein explained this effect with his theory of light being composed of packets of energy, known as photons.

Einstein believed that each photon had a specific amount of energy, which was proportional to its frequency. When light shone on the metal surface, the photons would collide with the electrons in the metal. If the energy of the photon was greater than the energy required to free an electron from the metal (known as the work function), the electron would be emitted from the surface.

This theory challenged the classical view of light as a wave, which suggested that light intensity (or brightness) would increase the energy of the electrons emitted from the metal. However, experiments showed that the electrons were only emitted when the frequency of the light reached a certain threshold, regardless of the intensity of the light.

Einstein's explanation of the photoelectric effect was a key contribution to the development of quantum mechanics and helped to support the idea that light could be treated as both a wave and a particle. This theory is still widely accepted today and is considered one of Einstein's greatest contributions to science.
also,
In this video, we'll take a closer look at photocells and how they work. A photocell, also known as a light-dependent resistor (LDR), is a type of resistor that changes its resistance depending on the amount of light that falls on its surface. We'll demonstrate how to use a photocell to control the brightness of an LED light. Whether you're an engineer or a hobbyist, this video will provide a great understanding of photocells and how they can be utilized in various applications. So sit back, relax, and get ready to learn about photocells!
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