EVERYTHING ABOUT LIGHT
Look around you wherever you are. Everything you see is information that is shown to you by light.
What is light and how is created?
There are several theories about how light formed to see together: Imagine if there was no light, you could not see anything! Worse, there was no life on earth.
Newton’s theory:
Newton imagined light as a line, which happened to have reflection, and he believed that light made up of small particles and shines from a light source. By proving this theory, problems related to lenses and mirrors can solved.
Huygens theory:
Huygens also believed that light is in the form of waves with which we can understand the type of color and wavelength decomposition.
Planck’s theory:
He assumed that light is composed of tiny packets called photons. Every source and body has molecular conditions and every molecule has energy, energy forms heat and heat creates radiation, as a result, the sum of energy, heat and radiation form the frequency, since every molecule is an electron. Yes, the movement of electrons that have an electric charge is in a rotational movement in the layers around the atom that creates energy and an electric field, and when they move, they generate energy in a rotational motion.
Light itself is an electromagnetic radiation whose wavelength is between 380 and 750 nm and is easily seen by the eye.
What is light made of?
Let us find out about it together:
Light also has an invisible form, such as infrared, ultraviolet, X-rays, radio waves, etc. The electromagnetic spectrum is very wide, visible light is not much different from invisible light; the only difference is that we can see visible light with our eyes, but it’s not invisible light!
A visible light that we can see is a very small part of this electromagnetic spectrum. The wave less than about 400 nm is called ultraviolet and more than 700 nm is infrared, which unfortunately or fortunately cannot be seen.
The aurora passes through the earth’s atmosphere and has a noticeable reduction, which causes all the radiation whose wavelength is less than 290 nm to be filtered before reaching the earth.
Before we talk about light, know that photons are also small packets found in light.
Now we want to talk about how light is formed:
The nature of light is that it is an electromagnetic beam made up of photons, when it shines on objects it makes us see everything around us.
When photons flow, they produce a wave that is equal to the speed of light produced. Photon is the smallest unit of measurement of energy that can be moved and can be in the form of particles or waves, and these applications are used in the field of optics and photonics in addition to lighting.
What makes electromagnetic waves different is the wavelength. The energy level of photons is indicated by the Greek letter lambda λ according to their wavelength.
Photon energy is directly proportional to the frequency of the photon, but it is inversely proportional to the wavelength. The frequency is also measured by the number of cycles or the same wavelength per second.
Light is measured by the intensity value, and the more photons, the greater the wave amplitude. The figure below shows photons that have the same wavelength (λ), frequency and energy, but their intensity is different. Amplitude is a quantitative characteristic of light, while wavelength determines the nature of light qualitatively.
Which wave spectrum do plants need?
Which waves are useful for humans and which waves are harmful?
The waves of the electromagnetic spectrum are divided into two large categories depending on the energy of the wave, and whether or not they are harmful to human health:
Ionizing radiation and non- ionizing radiation
Nonionizing radiation (ultraviolet rays, X-rays, and gamma rays) has enough energy in one photon to separate electrons from atoms or break chemical bonds. That’s why X-rays are pulse wave type, which means they are used for a short period of time, and when they want to take images in the dental office, they use a special vest or it is recommended that we use sunscreen when we are exposed to sunlight. Let’s use it, because there is the end of the visible light spectrum of ultraviolet rays, which is one of the ionizing radiations and destroys living tissues.
