Electromagnetic Waves
Electromagnetic waves are transverse waves consisting of oscillating electric and magnetic fields, perpendicular to each other and to the direction of propagation, travelling at c = 3 × 10⁸ m/s in a vacuum. Unlike mechanical waves (sound, water waves ), electromagnetic waves need no medium — they travel through empty space.
The electromagnetic spectrum: all 7 regions from radio waves to gamma rays, with wavelengths, frequencies, energies, and real-world applications explained .
Parts of the electromagnetic spectrum
Waves in the electromagnetic spectrum can all travel through a vacuum at the speed of light. The wide range of frequencies and wavelengths of different waves have a variety of uses.
The waves we've dealt with so far in this book have been fairly easy to visualize. Waves involving springs/masses, strings, and air molecules are things we can apply our intuition to. But we'll now switch gears and talk about electromagnetic waves . These are harder to get a handle on, for a number of reasons. First, the things that are oscillating are electric and magnetic ̄elds, which are ...
Electromagnetic waves
Unlike sound waves , which must travel through matter by bumping molecules into each other like dominoes (and thus can not travel through a vacuum like space), electromagnetic waves do not need molecules to travel. They can travel through air, solid objects, and even space, making them very useful for a lot of technologies.
Wave Behaviors: Light waves across the electromagnetic spectrum behave in similar ways and can be transmitted, reflected, absorbed, refracted, polarized, diffracted, or scattered depending on the composition of an object the wave encounters.
Electromagnetic spectrum
A diagram of the electromagnetic spectrum, showing various properties across the range of frequencies and wavelengths 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.
electromagnetic spectrum, the entire distribution of electromagnetic radiation according to frequency or wavelength. Although all electromagnetic waves travel at the speed of light in a vacuum, they do so at a wide range of frequencies, wavelengths, and photon energies.
Electromagnetic radiation
In physics, electromagnetic radiation (EMR) or an electromagnetic wave (EMW) is a self-propagating wave of the electromagnetic field that carries momentum and radiant energy through space. [1]: 430 [2] It encompasses a broad spectrum, classified by frequency (inversely proportional to wavelength), ranging from radio waves , microwaves, infrared ...
Anatomy of an Electromagnetic Wave Energy, a measure of the ability to do work, comes in many forms and can transform from one type to another. Examples of stored or potential energy include batteries and water behind a dam. Objects in motion are examples of kinetic energy. Charged particles—such as electrons and protons—create electromagnetic fields when they move, and these fields ...