Electromagnetic Energy
Electromagnetic Energy - Related Videos
02:37
The Electromagnetic Spectrum
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2020
The electromagnetic spectrum consists of all the types of electromagnetic radiation arranged according to their frequency and wavelength. Each of the various colors of visible light has specific frequencies and wavelengths associated with them, and you can see that visible light makes up only a small portion of the electromagnetic spectrum. Because the technologies developed to work in various parts of the electromagnetic spectrum are different, for reasons of convenience and historical...
01:24
The Electromagnetic Spectrum
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2025
Electromagnetic waves are categorized according to their wavelengths and frequencies, giving the electromagnetic spectrum. These waves are classified as radio, infrared, ultraviolet, etc. Radio waves refer to electromagnetic radiation with wavelengths ranging from millimeters to kilometers. Radio waves are commonly used for audio communications (i.e., radios) and typically result from an alternating current in the wires of a broadcast antenna. They cover a broad wavelength range and are used...
01:22
Energy Carried By Electromagnetic Waves
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2023
Anyone who has used a microwave oven knows there is energy in electromagnetic waves. Sometimes, this energy is obvious, such as in the summer sun's warmth. At other times, it is subtle, such as the unfelt energy of gamma rays, which can destroy living cells. Electromagnetic waves bring energy into a system through their electric and magnetic fields. These fields can exert forces and move charges in the system and, thus, do work on them. However, there is energy in an electromagnetic wave,...
01:35
Light as Energy
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2019
The energy required to carry out photosynthesis is light— typically electromagnetic radiation from the sun. The range of all possible wavelengths is known as the electromagnetic spectrum. Photons A photon is a discrete electromagnetic particle or bundle of energy. Photons are characterized by their frequency, wavelength, and amplitude, similar to the properties of a wave. Waves with higher frequencies transmit more energy and have shorter wavelengths than longer wavelengths that transmit less...
04:10
What is Energy?
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2020
The universe is composed of matter in different forms, and all forms of matter contain energy. The different forms of energy on Earth originate from the Sun — the ultimate energy source. Plants capture light energy from the Sun, and, via the process of photosynthesis, convert it into chemical energy. This stored energy from plants can be harnessed in many ways. For example, eating plant products as food provides energy for our body to function, and burning wood or coal (fossilized plants)...
FAQs
At the photon level, frequency determines the amount of electromagnetic energy exchanged: higher-frequency photons carry more energy than lower-frequency photons. This relationship provides a way to compare radiation across the spectrum without treating every band as identical. It helps explain why radio waves, visible light, ultraviolet radiation, X-rays, and gamma rays can produce different effects when they interact with matter.
The spectrum is organized by frequency, and its named regions correspond to radiation with different frequencies and effects. Radio waves, microwaves, infrared, visible, ultraviolet, X-rays, and gamma rays therefore represent distinct portions of one broader electromagnetic range. Comparing these regions helps researchers choose radiation appropriate to communication, imaging, spectroscopy, or studies of material interactions.
The wave description explains how electromagnetic energy can move through space as electric and magnetic fields that oscillate together. Each field helps generate and sustain the other, so the disturbance continues transporting energy. This view is useful when considering propagation, while the photon description addresses how that energy is exchanged with matter.
Because photon energy depends on frequency, radiation at different frequencies does not interact with matter in exactly the same way. This dependence helps organize questions about effects across the spectrum, from radio waves through gamma rays. It also gives physics a common link between measurable wave behavior and the energy exchanged during radiation-matter interactions.
Wireless communication is one practical use of electromagnetic energy because electromagnetic waves can transport energy through space. The application connects a fundamental physics model, based on coupled oscillating electric and magnetic fields, with the transmission of information. Its inclusion alongside imaging and spectroscopy shows the breadth of electromagnetic applications across science and technology.
These applications emphasize different ways electromagnetic energy can provide scientific or practical information. Medical imaging applies radiation to the production of images, whereas spectroscopy focuses on radiation and its interaction with matter. Together, they show why understanding frequency, photon energy, and spectral regions matters beyond describing waves alone.
Solar power is an application in which electromagnetic energy from radiation is central. The photon perspective helps describe energy in discrete exchanges, while the wave perspective describes energy carried through space. Using both descriptions places solar-power research within the broader physics of the electromagnetic spectrum and its interaction with matter, rather than treating it as an isolated technology.