Electromagnetic (EM) radiation is a form of energy that is all around us and takes many forms, such as radio waves, microwaves, X-rays and gamma rays. Sunlight is also a form of EM energy, but visible light is only a small portion of the EM spectrum, which contains a broad range of electromagnetic wavelengths. Electromagnetic theory Electricity and magnetism were once thought to be separate forces.
However, in 1873, Scottish physicist James Clerk Maxwell developed a unified theory of electromagnetism. The study of electromagnetism deals with how electrically charged particles interact with each other and with magnetic fields.
Nov 14, 2014 The Electromagnetic Spectrum The electromagnetic (EM) spectrum is the range of all types of EM radiation. Easiest software for downloading your videos off of youtube for mac. Radiation is energy that travels and spreads out as it goes – the visible light that comes from a lamp in your house and the radio waves that come from a radio station are two types of electromagnetic radiation. 
The wavelength of an electromagnetic wave is the distance between wave crests. The other property used to describe every wave is the wave amplitude which is one half the height from the peak of a crest to the lowest point of the wave.
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There are four main electromagnetic interactions: • The force of attraction or repulsion between electric charges is inversely proportional to the square of the distance between them. • Magnetic poles come in pairs that attract and repel each other, much as electric charges do. • An electric current in a wire produces a magnetic field whose direction depends on the direction of the current.
• A moving electric field produces a magnetic field, and vice versa. Maxwell also developed a set of formulas, called Maxwell's equations, to describe these phenomena. Waves and fields EM radiation is created when an atomic particle, such as an electron, is accelerated by an electric field, causing it to move. The movement produces oscillating electric and magnetic fields, which travel at right angles to each other in a bundle of light energy called a photon. Photons travel in harmonic waves at the fastest speed possible in the universe: 186,282 miles per second (299,792,458 meters per second) in a vacuum, also known as the speed of light.
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The waves have certain characteristics, given as frequency, wavelength or energy. Electromagnetic waves are formed when an electric field (shown in red arrows) couples with a magnetic field (shown in blue arrows). Magnetic and electric fields of an electromagnetic wave are perpendicular to each other and to the direction of the wave. Credit: NOAA. A wavelength is the distance between two consecutive peaks of a wave. This distance is given in meters (m) or fractions thereof.