Molly Ayala
Electromagnetic waves are typically described by their frequency, wavelength, or photon energy. The electromagnetic spectrum is the full range of electromagnetic radiation, which includes radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. These waves are produced by the movement of charged particles, such as electrons and protons, and they have crests and troughs similar to ocean waves. The frequency of an electromagnetic wave is measured in cycles per second, or Hertz, and it is inversely proportional to the wavelength. While there are differences in how these waves are produced and interact with matter, they are all made up of photons and are fundamentally electromagnetic radiation.
| Characteristics | Values |
|---|---|
| Definition | Electromagnetic radiation can be described in terms of a stream of massless particles, called photons, each traveling in a wave-like pattern at the speed of light. |
| Types | Radio waves, gamma-rays, visible light, microwaves, infrared light, ultraviolet light, X-rays |
| Photon Energy | Radio waves have the lowest photon energy, while gamma rays have the highest photon energy |
| Wavelength | Radio waves have the longest wavelengths, while gamma rays have the shortest wavelengths |
| Interaction with Matter | Electromagnetic radiation interacts with matter in different ways across the spectrum. For example, radio waves can be emitted and received by antennas and pass through the atmosphere, foliage, and most building materials. Gamma rays, X-rays, and extreme ultraviolet rays are called ionizing radiation because their high photon energy can ionize atoms, causing chemical reactions. |
| Practical Applications | Doctors use gamma-ray imaging to see inside the human body. Radio waves are used for broadcasting and can be emitted and received by antennas. |
| Visibility | Electromagnetic radiation with a wavelength between 380 nm and 760 nm (400-790 terahertz) is detected by the human eye and perceived as visible light. |
| Doppler Shift | The region of the spectrum where electromagnetic radiation is observed may differ from the region it was emitted in due to the relative velocity of the source and observer (the Doppler shift). |
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What You'll Learn
- The electromagnetic spectrum is divided into separate bands, each with different frequencies
- Radio waves, microwaves, infrared, visible light, UV light, X-rays, and gamma rays are all electromagnetic waves
- Electromagnetic waves are described by their frequency, wavelength, or photon energy
- Wavelength and frequency are inversely proportional; gamma rays have very short wavelengths and very high frequencies
- The Earth's atmosphere absorbs most electromagnetic radiation from space, but some radio frequencies, visible light, and UV light reach sea level
The electromagnetic spectrum is divided into separate bands, each with different frequencies
The electromagnetic spectrum is a range of frequencies, wavelengths, and photon energies. It is divided into separate bands, each with different frequencies, and these bands have different names for the electromagnetic waves within them. From low to high frequency, the bands are: radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. Radio waves, at the low-frequency end of the spectrum, have the lowest photon energy and the longest wavelengths—thousands of kilometres or more. They can be emitted and received by antennas and pass through the atmosphere, foliage, and most building materials.
Gamma rays, at the high-frequency end of the spectrum, have the highest photon energies and the shortest wavelengths—much smaller than an atomic nucleus. Doctors use gamma-ray imaging to see inside the human body. The biggest gamma-ray generator is the universe itself. Radio waves, gamma rays, visible light, and all the other parts of the electromagnetic spectrum are electromagnetic radiation.
Although these "different kinds" of electromagnetic radiation form a quantitatively continuous spectrum of frequencies and wavelengths, the spectrum remains divided for practical reasons arising from qualitative interaction differences. For example, red light resembles infrared radiation in that it can excite and add energy to some chemical bonds. However, unlike red light, infrared radiation does not have sufficient energy to ionize atoms. Instead, it powers the chemical mechanisms responsible for photosynthesis and the working of the visual system.
There are no precisely defined boundaries between the bands of the electromagnetic spectrum; rather, they fade into each other like the bands in a rainbow. Radiation of each frequency and wavelength (or in each band) has a mix of properties of the two regions of the spectrum that bound it.
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Radio waves, microwaves, infrared, visible light, UV light, X-rays, and gamma rays are all electromagnetic waves
Radio waves have photons with low energies, the longest wavelengths (thousands of kilometres or more), and the lowest frequencies. They can be emitted and received by antennas and can pass through the atmosphere, foliage, and most building materials. Radio waves are produced by radio stations and can be picked up by radios.
Microwaves are radio waves of short wavelength, from about 10 centimetres to one millimetre. They have slightly higher energy than radio waves. They are produced by devices such as klystron and magnetron tubes, as well as solid-state devices like Gunn and IMPATT diodes. Microwaves are used for satellite communication and wireless networking technologies such as Wi-Fi.
Infrared light has photons with more energy than microwaves. It is invisible to the human eye but can sometimes be felt as heat. It is located just beyond the red side of the rainbow.
Visible light is the only part of the electromagnetic spectrum that is visible to the human eye. It makes up about 47% of the energy that reaches Earth from the Sun. It represents the range of colours that white light can be split into, with each colour corresponding to a different wavelength.
UV light, or ultraviolet radiation, is the next highest frequency after violet light, which is the end of the visible spectrum. It is invisible to the human eye and has sufficient energy to ionize atoms, causing chemical reactions.
X-rays are generated by electronic transitions involving energetically deep inner atomic electrons. They can travel through parts of the human body but are reflected or stopped by denser matter such as bones.
Gamma rays are the most energetic form of electromagnetic radiation, with the highest frequencies and the shortest wavelengths. They are produced by nuclear decay or other nuclear and subnuclear processes. Gamma-ray imaging is used to see inside the human body.
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Electromagnetic waves are described by their frequency, wavelength, or photon energy
Electromagnetic waves are a type of electromagnetic radiation (EMR) that can be described by their frequency, wavelength, or photon energy.
EMR is a self-propagating wave of the electromagnetic field that carries momentum and radiant energy through space. It encompasses a broad spectrum, classified by frequency or its inverse, wavelength. This spectrum ranges from low-frequency radio waves to high-frequency gamma rays, including microwaves, infrared light, ultraviolet light, and X-rays. Each type of EMR has a different range of frequencies and wavelengths, and these two properties are inversely proportional, meaning that as one increases, the other decreases. For example, radio waves have long wavelengths of up to 1 km, while gamma rays have very short wavelengths that are fractions of the size of atoms.
The frequency of electromagnetic waves is measured in cycles per second, or Hertz (Hz). Frequencies observed in astronomy range from very high frequencies of 2.4x10^23 Hz in gamma rays to low frequencies of around 1 kHz in radio waves. The wavelength of these waves is measured in meters, with longer wavelengths corresponding to lower frequencies and shorter wavelengths to higher frequencies.
Photon energy is another property that can be used to describe electromagnetic waves. Photons are massless particles that travel in a wave-like pattern at the speed of light, and each photon contains a certain amount of energy. The different types of electromagnetic radiation are defined by the amount of energy found in their photons. For example, radio waves have low-energy photons, while gamma rays have the highest energy photons of all. The energy of photons is measured in electron volts (eV), and this energy is related to the frequency and wavelength of the electromagnetic wave in a precise mathematical way.
The behavior and interaction of electromagnetic waves with matter depends on their frequency, wavelength, and photon energy. Lower-frequency, longer-wavelength radiation such as radio waves and visible light can reach the surface of the Earth, while most other types of EMR are absorbed by the Earth's atmosphere. In medicine, gamma-ray imaging is used to see inside the human body. The uses of EMR in communication, medicine, industry, and scientific research are influenced by its wavelength and frequency characteristics.
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Wavelength and frequency are inversely proportional; gamma rays have very short wavelengths and very high frequencies
Electromagnetic waves are typically described by their frequency, wavelength, or photon energy. Frequency is measured in cycles per second, or Hertz, and wavelength is measured in meters.
Wavelength and frequency are inversely proportional to each other. This means that as the wavelength of a wave increases, its frequency decreases, and vice versa. This relationship is described by the equation c = fλ, where c is the speed of light. This principle is foundational in physics and is essential for understanding the behaviour of electromagnetic waves.
Gamma rays, for example, have very high frequencies and very short wavelengths. They have frequencies of around 10^20 to 10^24 Hz and wavelengths of less than 10^-12 meters. On the other hand, radio waves have low frequencies, typically around 10^5 to 10^8 Hz, and long wavelengths of thousands of kilometers or more.
The electromagnetic spectrum, which includes light, ranges from low to high-frequency waves: radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. Gamma rays are used in medical imaging to see inside the human body, while radio waves are used in conventional electronics.
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The Earth's atmosphere absorbs most electromagnetic radiation from space, but some radio frequencies, visible light, and UV light reach sea level
Electromagnetic radiation can be described in terms of energy, wavelength, or frequency. Frequency is measured in cycles per second, or Hertz, and wavelength is measured in meters. Energy is measured in electron volts. Each of these three quantities for describing electromagnetic radiation is related to each other in a precise mathematical way. The electromagnetic spectrum is the full range of electromagnetic radiation, organized by frequency or wavelength. The spectrum is divided into separate bands, with different names for the electromagnetic waves within each band. From low to high frequency, these are: radio waves, microwaves, infrared, visible light, ultraviolet (UV) light, X-rays, and gamma rays.
Radio waves, at the low-frequency end of the spectrum, have the lowest photon energy and the longest wavelengths. They are produced by stars and gases in space and can be detected by ground-based observers. The frequency of each of these waves determines whether or not it is absorbed or able to pass through the atmosphere. Low-frequency radio waves are absorbed by the electrons in the ionosphere, while higher-frequency waves can pass through the atmosphere entirely and reach the ground.
Light, ultraviolet light, X-rays, and radio waves are all made up of photons and are all forms of electromagnetic radiation. However, they are produced by different processes and detected in different ways. For example, UV light is emitted by the Sun and is the reason skin tans and burns.
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Frequently asked questions
Electromagnetic waves are one of the two important ways that energy is transported in the world around us. They are created by moving charged particles, such as electrons and protons, and these fields transport what we call electromagnetic radiation, or light.
Radio waves, microwaves, infrared light, ultraviolet light, X-rays, and gamma rays are all types of electromagnetic waves.
Electromagnetic waves have a range of frequencies and wavelengths that make up the electromagnetic spectrum. While there are no precise boundaries between the bands of the spectrum, radio waves are at the low-frequency end, and gamma rays are at the high-frequency end.
Radio waves have low-energy photons and long wavelengths, while gamma rays have the highest photon energies and the shortest wavelengths.
Electromagnetic waves do not require a medium to propagate, meaning they can travel through air, solid materials, and even the vacuum of space. On the other hand, mechanical waves, such as sound waves and water waves, require a medium to travel through.
