Beatrice Lang
Electromagnetic waves are a form of radiation that travels through the universe. They are formed when an electric field couples with a magnetic field. Electromagnetic waves are produced by accelerating charged particles and can be naturally emitted by the Sun and other celestial bodies, or artificially generated. The energy in these waves is sometimes referred to as radiant energy and can be described by frequency, wavelength, or energy. Electromagnetic waves have crests and troughs, with the shortest wavelengths being fractions of the size of an atom, and the longest currently studied being larger than the diameter of our planet.
| Characteristics | Values |
|---|---|
| Definition | A high-frequency alternating-current cycle considered as a wave propagated with definite velocity in a conductor |
| Other names | Electromagnetic waves, electromagnetic radiation, light |
| Producers | Charged particles such as electrons and protons |
| Energy type | Electromagnetic energy, also known as radiant energy |
| Velocity | Equal to the velocity of light |
| Propagation | Does not need a medium to travel through space; can move through a vacuum |
| Components | Electric field and magnetic field |
| Relationship between components | The electric and magnetic fields are perpendicular to each other and to the direction of the wave |
| Waveform | Can be a plane wave or a spherical wave |
| Behaviour | Exhibits superposition, constructive interference, and destructive interference |
| Units | Frequency (Hertz), wavelength (meters), and energy (electron volts) |
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What You'll Learn
Electromagnetic waves
The energy transported by electromagnetic waves is called electromagnetic radiation or radiant energy. This energy is produced by accelerating charged particles, such as electrons and protons, and can be emitted naturally by celestial bodies like the Sun or artificially generated for specific applications. Electromagnetic radiation can be described in terms of its frequency, wavelength, or energy, with all three being mathematically related. The frequency of a wave refers to its rate of oscillation and is measured in hertz (Hz), where one hertz equals one oscillation per second.
Electromagnetic radiation exhibits both wave-like and particle-like properties, known as wave-particle duality. This duality depends on the timescale and distance over which the radiation is measured, with wave characteristics being more apparent over larger timescales and distances, and particle characteristics becoming more evident at smaller scales. The interaction of electromagnetic radiation with matter depends on its wavelength, influencing its use in fields such as communication, medicine, industry, and scientific research.
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How electrical waves are formed
An electric wave is a high-frequency alternating-current cycle that is propagated with a definite velocity in a conductor. Electric waves are a type of electromagnetic wave, which are formed when an electric field couples with a magnetic field.
Electromagnetic waves are a form of electromagnetic radiation that travels through the universe. They are composed of oscillating electric and magnetic fields, which are perpendicular to each other and to the direction of the wave. These fields can be static, such as the energy that can make your hair stand on end, or the force that holds a magnet to a refrigerator. However, when they change or move together, they create electromagnetic waves.
Electromagnetic waves are created by accelerating charged particles, such as electrons and protons, which are called electromagnetic fields when they move. These fields can be naturally emitted, such as from the Sun and other celestial bodies, or artificially generated for various applications. For example, when you listen to the radio, connect to a wireless network, or cook dinner in a microwave oven, you are using electromagnetic waves.
The energy in electromagnetic waves is sometimes called radiant energy and can be described by frequency, wavelength, or energy. All three are related mathematically, meaning that if you know one, you can calculate the other two. Radio and microwaves are usually described in terms of frequency (Hertz), while infrared and visible light are described in terms of wavelength (meters), and x-rays and gamma rays in terms of energy (electron volts). The velocity of an electromagnetic wave is dependent on the medium through which it is travelling, while other properties such as frequency, time period, and wavelength are dependent on the source producing the wave.
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Electrical waves in conductors
An electric wave is a high-frequency alternating-current cycle that is propagated with a definite velocity in a conductor. Electromagnetic waves are formed by the movement of charged particles such as electrons and protons. These charged particles create electromagnetic fields as they move, and these fields transport electromagnetic radiation or light.
Electromagnetic waves have crests and troughs, similar to ocean waves, and the distance between crests is the wavelength. The shortest wavelengths are fractions of the size of an atom, while the longest can be larger than the diameter of our planet. Electromagnetic waves can be described by their frequency, wavelength, or energy, and all three are mathematically related. The number of crests that pass a given point in one second is the frequency of the wave, measured in Hertz (Hz).
Electromagnetic waves can be further classified into plane waves and spherical waves. Plane waves can be considered a limiting case of spherical waves at a very large distance from the source. Both types of waves can have a waveform that is a function of time, and this can be decomposed by Fourier analysis into individual sinusoidal components, each with its own frequency, amplitude, and phase.
Electromagnetic waves in conductors, or electromagnetic waveguides, are an important application of electromagnetic waves. The propagation of these waves through a conductor is governed by the conductor's properties, such as its conductivity and permittivity. The amplitude of an electromagnetic wave propagating through a conductor decreases exponentially with the conductor's characteristic length scale, known as the skin depth. This skin depth is smaller at higher frequencies, meaning that high-frequency waves penetrate a shorter distance into a conductor than low-frequency waves.
The interaction of electromagnetic waves with conductors has important implications for various applications. For example, the reflection of electromagnetic waves by perfect conductors is utilized in silvered and fully metal mirrors. Additionally, the propagation of electromagnetic waves through conductors, such as copper wires, leads to the "skin effect," where an oscillating electromagnetic signal is confined to a narrow layer on the surface of the conductor.
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Electrical waves as radiation
An electric wave is a high-frequency alternating-current cycle that is propagated with a definite velocity in a conductor. Electric waves are closely associated with electromagnetic waves and radiation. Electromagnetic waves are formed when an electric field couples with a magnetic field. These waves have crests and troughs similar to ocean waves, and the distance between the crests is the wavelength. Electromagnetic waves can be visualised as a series of very regular waves that travel at an enormous speed—the speed of light.
Electromagnetic radiation is produced by accelerating charged particles and can be naturally emitted by the Sun and other celestial bodies, or artificially generated for various applications. The energy in these waves is sometimes referred to as radiant energy. Electromagnetic waves do not require a medium to travel through space; they move through a vacuum at the speed of light. They can travel through air, solid objects, and even space, making them very useful for many technologies.
The terms light, electromagnetic waves, and radiation all refer to the same physical phenomenon: electromagnetic energy. This energy can be described by its frequency, wavelength, or energy. Electromagnetic waves encompass a broad spectrum, ranging from long radio waves to very short gamma-rays. The size of the waves is related to their energy—the smaller the wavelength, the higher the energy.
Electromagnetic radiation exhibits both wave and particle properties, known as wave-particle duality. The wave characteristics are more apparent when measured over large timescales and distances, while particle characteristics are more evident when measuring small timescales and distances. For example, when electromagnetic radiation is absorbed by matter, its particle-like properties become more obvious when the average number of photons in the cube of the relevant wavelength is much smaller than one.
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Electrical waves in technology
Electrical waves, also known as electromagnetic waves, are a form of radiation that travels through the universe. They are created when an electric field couples with a magnetic field. These fields are caused by moving charged particles such as electrons and protons.
Electromagnetic waves have crests and troughs similar to ocean waves, with the distance between crests known as the wavelength. The shortest wavelengths are fractions of the size of an atom, while the longest can be larger than the diameter of our planet. The energy of the wave is related to its size: the smaller the wavelength, the higher the energy.
Electromagnetic waves can be naturally emitted, such as by the Sun and other celestial bodies, or artificially generated for various applications. They do not require a medium to propagate, meaning they can travel through air, solid materials, and the vacuum of space. This makes them useful for communication technology, such as RADAR, UV detection of forged bank notes, and infrared night vision and security cameras.
The velocity of electromagnetic waves is dependent on the medium through which they are travelling, while other properties such as frequency, time period, and wavelength are dependent on the source producing the wave. The energy of an electromagnetic wave can also be described in terms of its frequency and wavelength, with radio and microwaves usually described in terms of frequency (Hertz), and x-rays and gamma rays in terms of energy (electron volts).
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Frequently asked questions
Electrical waves, also known as electromagnetic waves, are a form of radiation that travels through the universe. They are formed when an electric field couples with a magnetic field. Electromagnetic waves are produced by accelerating charged particles and can be naturally emitted by the Sun and other celestial bodies, or artificially generated.
Electromagnetic waves include radio waves, microwaves, infrared, visible light, x-rays, and gamma rays. These waves vary in size and energy, with radio waves being very long and gamma rays being very short.
Electromagnetic waves have crests and troughs similar to ocean waves, with the distance between crests being the wavelength. The energy of an electromagnetic wave is related to its wavelength, with shorter wavelengths having higher energy. The energy in these waves is called radiant energy and can be described by frequency, wavelength, or energy.
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