Types of Electromagnetic Waves
- Radio Waves. Radio waves have the longest wavelengths of all the electromagnetic waves.
- Microwaves. Microwaves are shorter than radio waves with wavelengths measured in centimeters.
- Infrared. Between microwaves and visible light are infrared waves.
- Visible light.
- Ultraviolet.
- X-rays.
- Gamma rays.
- Activities.
Answer and Explanation: All electromagnetic waves have two wavefronts, which are an oscillating electric field and an oscillating magnetic field. They also all travel at the
E is the electric field vector, and B is the magnetic field vector of the EM wave. For electromagnetic waves E and B are always perpendicular to each other and perpendicular to the direction of propagation. Electromagnetic waves are transverse waves. The wave number is k = 2π/λ, where λ is the wavelength of the wave.
So the power delivered by a low frequency radiation comes in a great number of small packets, while the same amount of power carried by an higher frequency radiations is composed by few large packets. This is the reason why high frequency radiation is more harmful than lower frequency radiation.
In the vacuum of space, there are no (or very, very few) particles to vibrate, so sound cannot travel through this medium. Radio waves travel perfectly fine through a vacuum because they are a type of electromagnetic wave (light), and electromagnetic waves do not need a medium to travel through.
When traveling in a vacuum, electronic waves from the electromagnetic spectrum all travel at the same speed. The thing that makes the waves different is their respective wavelengths, which in turn determines their respective frequencies.
When electromagnetic waves travel through a medium, the speed of the waves in the medium is v = c/n(λfree), where n(λfree) is the index of refraction of the medium. The index of refraction n is a properties of the medium, and it depends on the wavelength λfree of the EM wave.
They all have things in common. In a vacuum, they all travel at the same speed - the speed of light - which is 3 × 108 m/s. They are all transverse waves, with the oscillations being electric and magnetic fields. Like all waves, they can be reflected, refracted and diffracted.
Using some not-so-simple calculus, Maxwell's equations can be used to show that the electric and magnetic fields obey wave equations. The speed c of an electromagnetic wave is determined by the constants of electricity and magnetism that you know so well: c = 1/(e0m0)1/2 = 2.998 X 108m/s.
Electromagnetic waves are waves that consist of vibrating electric and magnetic fields. An electromagnetic wave begins when an electrically charged particle vibrates. This causes a vibrating electric field, which in turn creates a vibrating magnetic field. The two vibrating fields together form an electromagnetic wave.
The electromagnetic waves are not mechanical waves. There are vibrations of electric vector and magnetic vector in them. These vibrations do not need any particles present in the medium for their propagation. That's why electromagnetic waves do not require any medium for propagation.
Polarization (also polarisation) is a property applying to transverse waves that specifies the geometrical orientation of the oscillations. In linear polarization, the fields oscillate in a single direction. In circular or elliptical polarization, the fields rotate at a constant rate in a plane as the wave travels.
Light Is Also a Particle!
Now that the dual nature of light as "both a particle and a wave" has been proved, its essential theory was further evolved from electromagnetics into quantum mechanics. Einstein believed light is a particle (photon) and the flow of photons is a wave.An electromagnetic wave can be created by accelerating charges; moving charges back and forth will produce oscillating electric and magnetic fields, and these travel at the speed of light.
Radio waves travel like light waves. They transmit radio waves through space to antennas here on the ground.) Sound travels at approximately 1,100 feet per second (766 miles per hour). Radio waves travel at the speed of light, which is approximately 186,000 miles per second.
Electromagnetic waves differ from mechanical waves in that they do not require a medium to propagate. This means that electromagnetic waves can travel not only through air and solid materials, but also through the vacuum of space.
In electromagnetic waves, energy is transferred through vibrations of electric and magnetic fields. In sound waves, energy is transferred through vibration of air particles or particles of a solid through which the sound travels. In water waves, energy is transferred through the vibration of the water particles.
Actually, radio waves can penetrate water. What limits transmission is conduction, and sea water is very conductive, and largely, in the case of sea water, absorption. There would be more reflection than absorption. If the oceans were of pure water, likely far more radio energy would travel through.
A material wave is the large movement of a disturbance in a medium from its equilibrium position, whereas the particles that make up the medium move very little.
In electromagnetic waves, energy is transferred through vibrations of electric and magnetic fields. In sound waves, energy is transferred through vibration of air particles or particles of a solid through which the sound travels. In water waves, energy is transferred through the vibration of the water particles.
You can see light from the moon, distant stars, and galaxies because light is an electromagnetic wave. Electromagnetic waves are waves that can travel through matter or through empty space. However, when light travels in matter, it interacts with the atoms and molecules in the material and slows down.
An EM wave can travel without a material medium—that is, in a vacuum or space empty of matter—and does not lose energy as it moves. In theory, an EM wave can travel forever. Because they do not need a medium, EM waves can pass through outer space, which is a near vacuum.
Electromagnetic waves are waves which can travel through the vacuum of outer space. This vibration creates a wave which has both an electric and a magnetic component. An electromagnetic wave transports its energy through a vacuum at a speed of 3.00 x 108 m/s (a speed value commonly represented by the symbol c).
Parts of the electromagnetic spectrum
A large family of waves, each with a different wavelength range is called the electromagnetic spectrum (sometimes shortened to the EM spectrum). These waves all travel at the speed of light (300,000,000 metres per second) in a vacuum.Light (and other elementary “particles”) are not particles at all, and are not waves at all. They are quanta, and quanta are weird. So, in the end, light can travel through a vacuum because it is composed of quanta called photons, and it is a property of photons that they require no medium of transmission.
Electromagnetic waves are waves which can travel through the vacuum of outer space. Mechanical waves, unlike electromagnetic waves, require the presence of a material medium in order to transport their energy from one location to another.
Radio waves are a kind of electromagnetic waves, similar to microwaves, IR, light and UV, X-rays and gamma rays, which as Tom has aptly described are self-regenerating electric and magnetic fields, they do not need a carrier or a medium for their propagation (unlike medium-dependent waves, such as pressure or sound
In a vacuum, all electromagnetic waves travel at approximately 3 x 10^8 m/s - the fastest speed possible. Radio waves are a type of electromagnetic radiation with wavelengths in the electromagnetic spectrum longer than infrared light. Radio waves have frequencies as high as 300 GHz to as low as 3 kHz.
