How Do Electromagnetic Waves Work?
The electromagnetic spectrum is the terminology used by many scientists to describe the visible portion of the electromagnetic spectrum. From gamma rays to x-rays, nearly all of the visible light in the visible world is, in reality, completely invisible to us! Light consists of a wavefront of electric and magnetic fields interacting with molecules in a vacuum. This interaction produces light.
Light cannot be seen because it has no matter that could cause it to vibrate or move into a different state. Light cannot be transformed from one state to another, because nothing can make the electric or magnetic fields dip, stretch, or move in any way. So we cannot see light at all. We only detect it by its wavelength – the length and width of its wave. Thus, we know that light consists of electromagnetic waves.
When an electron strikes an atom, it gives off an electromagnetic energy. The length of this electromagnetic energy, called the electromagnetic frequency, depends on the number of electrons present in the atom. When an atom absorbs energy, it becomes excited, emitting radiation in the form of infrared radiation. Most infrared telescopes are based on the principle of using the diameter of an object to detect the presence of radiation. In fact, the diameter of an object does not restrict the detection of infrared radiation, as some extremely large objects have very little amount of radiation emitting power.
Infrared, or “ultraviolet”, is another form of electromagnetic spectrum. Unlike visible light, which are electromagnetic energy, and ultraviolet light, which are electromagnetic energy with a shorter wavelength, ultraviolet light is electromagnetic radiation with a longer wavelength. Thus, UV rays have longer wavelengths. These long wavelengths limit the penetration of visible light. Therefore, visible light cannot pass through many deserts, ice caps, and ocean waters.
The third type of electromagnetic spectrum is “radio waves”. Radio waves are invisible, but they are the third most prevalent electromagnetic wave, after x-rays and microwaves. These waves are absorbed by objects and moved to the detectors in the form of electric signals. Some microwaves and x-rays can also penetrate objects, but radio waves cannot.
The strength of an electromagnetic wave can be measured by measuring its effect on an electric field. If an electromagnetic wave has a positive electric field, it will push an electron outwards, while if the wave has a negative electric field, it will push the electron towards a point. Radio waves have a different overall strength from electromagnetic radiation in the atmosphere, because the atmospheric magnetic field varies slightly.
There are three types of electromagnetic waves: electromagnetic, x-rays, and radio waves. X-rays are electromagnetic waves with shorter wavelengths, while microwaves are longer wavelengths. Radio waves can only be observed by satellite and other space satellites. They have longer wavelengths than visible light, including ultraviolet light, which cannot be seen by the human eye. Thus, these two types of electromagnetic waves are used primarily for medical imaging applications, where visible light cannot be used.
There are some common sources of electromagnetic waves, including radars, communications towers, and electric generators. Some researchers believe that we may soon find other electromagnetic wave sources, such as gamma-ray bursts or space debris. While we cannot monitor every source of electromagnetic radiation, we can learn more about the nature of electromagnetic waves through ongoing research. It is important to note that although electromagnetic waves are natural, harmful, or benign, they can still pose a risk to humans and our environment when they are used in certain ways. For instance, if an electromagnetic wave is intentionally set off within a human living room, this act can certainly disturb people.
