The Study of Light (Basic) - An Important Role of Modern Physic

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Do you know color is not really exist? Color is the visual perceptual property deriving from the spectrum of light interacting with the photoreceptor cells of the eyes. Color categories and physical specifications of color are associated with objects or materials based on their physical properties such as light absorption, reflection, or emission spectra. By defining a color space, colors can be identified numerically by their coordinates.

So What is Light ?

What is Light ?
Light is electromagnetic radiation and is a part of the electromagnetic spectrum. So we have to know about electromagnetic radiation before we talk about the light.

Then, what is Electromagnetic Radiation ?

According to an article of Khan Academy, electromagnetic radiation is one of the many ways that energy travels through space. The heat from a burning fire, the light from the sun, the X-rays used by your doctor, as well as the energy used to cook food in a microwave are all forms of electromagnetic radiation. While these forms of energy might seem quite different from one another, they are related in that they all exhibit wavelike properties.

These article is so simple and easily to understand about electromagnetic radiation. If you want to read full article, you can read here.

Now what is the electromagnetic spectrum ?

electromagnetic spectrum

The electromagnetic spectrum is the range of frequencies (the spectrum) of electromagnetic radiation and their respective wavelengths and photon energies. The electromagnetic spectrum covers electromagnetic waves with frequencies ranging from below one hertz to above 1025 hertz, corresponding to wavelengths from thousands of kilometers down to a fraction of the size of an atomic nucleus. Did you know electromagnetic waves ? I want to explain it with an example. Did you see the waves at the beach or if you dive into the swimming pool ? Yes, they are very similar. It had frequency and wavelength.

Electromagnetic waves one of the waves that are propagated by simultaneous periodic variations of electric and magnetic field intensity and it can be divided into 7 types according to its' frequency range.

radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.

Radio Waves are the lowest frequency and longest wavelength, and then gamma rays are the highest frequency and shortest wavelength.

Visible Light that You called Light

Visible Light

Did you see visible light in the 7 kinds of electromagnetic waves ? Yes, so light is a kind of electromagnetic waves. The wavelength of (visible) light is between 400 and 700 nanometers. It is between infrared and ultraviolet. In terms of frequency, it is between 430 and 750 hz. So the electromagnetic waves between 400 and 700 nanometers are called light. The other electromagnetic waves can not be seen with our eye and we use these waves in other field such as X-rays, gamma rays in medical field, radio waves in ICT field, etc... But ultraviolet light can make the cancer for our skin.

Types of ER

Light has also another properties Frequency, Wavelength else such as Intensity, Direction and Polatization. Like all forms of light (all electromagnetic waves), visible light emits tiny packets called photons and carries both wave and particle properties. This property is called wave-particle coupling. The study of light is an important area of research in modern physics.

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