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An electromagnetic wave is energy that does not need matter to propagate in traveling from one location to another. For example, radiation, visible light, microwaves, infra red, ultra violet, etc. In a vacuum they travel at almost 3x108 m/s. All electromagnetic waves have a magnetic and electrical field.
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Usually we call it light, but it includes microwaves, infrared light, visible light, ultraviolet light, X-rays, and gamma rays. Electromagnetic rays (light rays) are those in which both electrical and magnetic components are oscillating perpendicular to each other. These electrical and magnetic components oscillate in a plane perpendicular to the direction of propagation. Suppose an electromagnetic wave is propagating in the X-plane, then its two components oscillate in the y and z directions (in a Cartesian system)
LightElectromagnetic radiation is the term given to a type of radiation which includes, in order of decreasing energy: gamma rays, X-rays, UV rays, visible light (from violet to red), infra-red, microwaves, radio waves. All EM radiation travels at the speed of light because all it is is different forms of light, only a very small part of which humans can see.All EM radiation has a frequency and a wavelength. They are inversely proportional to each other, and FREQUENCY x WAVELENGTH = SPEED OF LIGHT. High frequency radiation is dangerous to living things because individual photons (or "particles of light") carry enough energy to break the chemical bonds which hold DNA together, and this can lead to cancer. This is why X-rays and UV light should be avoided. This is also the reason why, in theory, microwaves and radio waves cannot cause cancer; the individual parcels of energy are not powerful enough to break bonds. Because electrons in bonds can only accept one photon at a time, the number of photons (aka the intensity of the radiation) is irrelevant; only their strength matters.
Electromagnetic wave is associated with electric and magnetic fields resulting from the acceleration of an electric charge.
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∙ 11y ago
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Are electric phenomena and magnetic phenomena at all related?
well not entirely sure but i know that the forth quantum number accounts for the electron spin positive or negative and you can tell if the metal is ferromagnetic or paramagnetic if the spins are paired and cancle the net charge. mabey since the electromagnetic-wave theory suggests that light is an electromagneticwave composed of electric and magnetic fields that can exert forces on charged particles. so i think im close. and the photo-electric effect is a key experiment leading to quantum theory so that involves the effect of electromag raditn or light on substances, particularly certain metals. i don't know becasue this experiment actually releases electrons and they bounce off the "shiney" metal surface and the current is recorded. but i think also i may be off track becasue the metal is used just for light.if you look up "the normal Zeeman effect" it should direct you, its about the magnetic quantum number,the energies of the orbits are different when the atom is near a strong magnet. good luckcheers :)
