Photon is the Quantum of Electromagnetic | Energy of Photons
A photon is a particle of light, defined as an amount of electromagnetic (or light) energy. Photons are always in motion and in a vacuum (absolutely empty space) there is a constant speed of light for all observers. Photons travel at the speed of light in a vacuum (often called the speed of light) c = 300,000 km/s.
In physics, the photon or photon is called the fundamental particle of light and other electromagnetic radiation. The mass (and mass) of a photon is zero. Like all fundamental particles, photons also exhibit wave-particle dimorphism, that is, they have the same tendency to be both a wave and a particle.
The modern form of the photon was given by “Albert Einstein” through his experiments which could not explain the wave form of light. It takes about 23.7 seconds for a drop to fall from the sky. Light emitted from a single source such as a bulb has the same wavelength and frequency of a photon.
Photon is the Quantum of Electromagnetic
- Photons behave like a particle and a wave at the same time and always travel at the speed of light.
- The photon has zero mass.
- Photons carry energy and momentum.
- Photons can be absorbed and generated.
- Photons interact with other particles. For example, they can kick electrons out of an atom, giving them the energy they need to escape when they collide.
Energy of photons
Photon energy is the energy carried by a single photon. The amount of energy is directly proportional to the photon’s electromagnetic frequency and thus, equivalently, is inversely proportional to the wavelength. The higher the photon’s frequency, the higher its energy. Equivalently, the longer the photon’s wavelength, the lower its energy of photons.
How do Photons light up things
A light source – such as a lamp – emits millions of photons in a room that when turned on are scattered in all directions. Since the lamp is in a room (that is, in an enclosed space), the photons emitted from it collide with everything in their path, illuminating everything in the room.
Where do photos go when the light source is turned off?
As long as the lamp is on, a continuous stream of photon is received in the room. Of the myriad photons hitting an object (such as a table) in the room, some will be absorbed, while others will be reflected and lose some energy in the process. These reflected photons will collide with something else in the room and lose some more energy. Essentially, the photon would keep bouncing off objects until one of them absorbed it.
Thus, as long as the lamp is on, the room remains lit. However, once you turn it off, things change very quickly. The photons emitted before the lamp is turned off will continue to bounce off the objects until they are completely absorbed by the objects in the room. And it’s time to happen in only a fraction of a millisecond.
If the lamp continues to shine, the rapid absorption of these photons will not change anything, as it will continuously emit a new portion of photons into the room. But, as we already found out, when the lamp is turned off and no more photons are emitted, the objects in the room absorb the photons already emitted. Their energy is used to heat objects that have absorbed them, because, according to the first law of thermodynamics, energy cannot be created or destroyed, it only passes from one process to another.
Einstein’s Photon Theory
Albert Einstein thought that “light is a grain with energy according to its wavelength” regarding the “photoelectric effect” which cannot be explained by merely thinking of light as a wave. So I was able to explain it.
The photoelectric effect is a phenomenon in which electrons are ejected when a metal is exposed to blue light, but as with red light, no electrons are emitted, no matter how strong or long it is. To understand this, think of light as an energetic particle (lump), blue light is a high-energy light particle that can eject electrons.
And red light is a low-energy light that cannot do that. I had to think about it as a pimple. Thus, light has come to be called a “photon (photon, photon)” because it has not only the properties of waves but also the properties of grains.