why is called electromagnetic spectrum?
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The electromagnetic spectrum is the range of all possible electromagnetic radiation. Also, the "electromagnetic spectrum" (usually just spectrum) of an object is the range of electromagnetic radiation that it emits, reflects, or transmits.\n\nThe electromagnetic spectrum, shown in the table, extends from frequencies used in the electric power grid (at the long-wavelength end) to gamma radiation (at the short-wavelength end), covering wavelengths from thousands of kilometres down to fractions of the size of an atom. It is commonly said that EM waves beyond these limits are uncommon, although this is not actually true. The 22-year sunspot cycle, for instance, produces radiation with a period of 22 years, or a frequency of 1.4*10-9 Hz. At the other extreme, photons of arbitrarily high frequency may be produced by colliding electrons with positrons at appropriate energy. 1024 Hz photons can be produced today with man-made accelerators. In our universe the short wavelength limit is likely to be the Planck length, and the long wavelength limit the size of the universe itself (see cosmology), though in principle the spectrum is infinite.
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According to Maxwell's laws, one type of field can induce the other and vice versa. This makes electromagnetic waves possible.
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here's a link to a picture of the em spectrum along with corresponding wavelengths for each type of radiation:\n\nhttp://kingfish.coastal.edu/marine/Animations/Images/Electromagnetic-Spectrum-2.png
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A material's emission spectrum is the amount of electromagnetic radiation of each frequency it emits when it is heated (or more generally when it is excited).\n\nWhen the electrons in the element are excited, they jump to higher energy levels. As the electrons fall back down, and leave the excited state, energy is re-emitted, the wavelength of which refers to the discrete lines of the emission spectrum. Note however that the emission extends over a range of frequencies, an effect called spectral line broadening.\n\nThe term often refers to the visible light emission spectrum, although it extends to the whole electromagnetic spectrum, from the low energy radio waves up to high energy gamma rays.\n\nThe emission spectrum can be used to determine the composition of a material, since it is different for each element of the periodic table. One example is identifying the composition of stars by analysing the received light.
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Lighty is an electromagnetic ray that gives the sensation of sight.Electromagnetic waves are waves that donot need any material medium for their propogation.\n\n\nWhen a light falls on a polished surface like mirror reflection occures and this phenominon is called reflection\n\nWhen a light falls on a transparent substance like water  and glass it passes throuhg that medium and this phenominon is called refraction\n\nMagnification is the ratio of the size of the image to the size of the object
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Wavelengths slightly longer than red light are in the "near infrared" region of the electromagnetic spectrum.
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Radio waves are a form of electromagnetic radiation, created whenever a charged object (in normal radio transmission, an electron) accelerates with a frequency that lies in the radio frequency (RF) portion of the electromagnetic spectrum. In radio, this acceleration is caused by an alternating current in an antenna. Radio frequencies occupy the range from a few tens of hertz to three hundred gigahertz, although commercially important uses of radio use only a small part of this spectrum.[1]\n\nElectromagnetic radio spectrum \n\nOther types of electromagnetic radiation, with frequencies above the RF range, are microwave, infrared, visible light, ultraviolet, X-rays and gamma rays. Since the energy of an individual photon of radio frequency is too low to remove an electron from an atom, radio waves are classified as non-ionizing radiation.\n\nMobile phones and the network they operate under vary significantly from provider to provider, and even from nation to nation. However, all of them communicate through electromagnetic radio waves with a cell site base station
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The radio waves currently used for telecommunication or broadcasting are electromagnetic waves (non-ionizing radiation) which do not have enough energy to ionize atoms from materials. Although some of the electromagnetic waves, such as ionizing radiation including X-ray or gamma-ray, have high frequencies and strong energy that ionize atoms, they are very different from the radio waves we are dealing with; that is non-ionizing radiation.
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A spectrometer is an optical instrument used to measure properties of light over a specific portion of the electromagnetic spectrum. The variable measured is most often the light's intensity but could also, for instance, be the polarization state. The independent variable is usually the wavelength of the light, normally expressed as some fraction of a meter, but sometimes expressed as some unit directly proportional to the photon energy, such as wavenumber or electron volts, which has a reciprocal relationship to wavelength. A spectrometer is used in spectroscopy for producing spectral lines and measuring their wavelengths and intensities. Spectrometer is a term that is applied to instruments that operate over a very wide range of wavelengths, from gamma rays and X-rays into the far infrared.
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A spectrum is the derivative of broken light through a triangular shaped crystal, giving  as a result a spectrum or a rainbow of colors, and is used to determine many things about the light source. e.i. the composition of elements or gases of the source, among other uses. How scientists determine results is by measuring the amplitude and intensity of each color in the spectrum.
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All light (or more technically, electromagnetic radiation) is waves.  Light waves have different frequencies.  Ultraviolet light waves have a frequency higher than light waves in the visible spectrum (the frequencies humans can see).  Infrared light waves have a freqency lower than light waves.  The terms come from the fact that violet has the highest frequency in the visible spectrum, and red the lowest.
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By the process called spectroscopy. It is the separation of light spectrum by different methods (a prism more often). Now, a type of atom, like helium for example, will absorb a small wave light in the light spectrum (this appearing to us like a thin, black, vertical line). Every atom type absorbs different light Wave. By knowing the spectrum of every single atom, we can superpose them and "see" who's`s who, only by having sun light
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Electromagnetic radiation is a propagating wave in space with electric and magnetic components. These components oscillate at right angles to each other and to the direction of propagation.\n\nThe term electromagnetic radiation is also used as a synonym for electromagnetic waves in general, even if they are not radiating or travelling in free space. This sense includes, for example, light travelling through an optical fiber, or electrical energy travelling within a coaxial cable.\n\nElectromagnetic (EM) radiation carries energy and momentum which may be imparted when it interacts with matter.
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You are right! Atomic structure has everything to do with what wavelengths are absorbed, and which ones are reflected. I works with light, and it works with radio waves... Thats how they make stealth aircraft. Funny thing about copper... when powdered and burned, it makes a pretty green color!
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Electromagnetic Radiation\n\nElectromagnetic radiation is the result of oscillating electric and magnetic fields. The wave of energy generated by such vibrations moves through space at the speed of light. And well it should... for visible light is indeed one form of electromagnetic (EM) radiation.
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Yes, a radio wave is an elecromagnetic wave just as light, X-rays, microwave, gamma rays, etc.  All carried by photons.  Radio waves are the least energetic, or longest wavelength, of the electromagnetic spectrum.  Sound waves, on the other hand, are like waves in water, or sand dunes-they are movements of atoms-air, in the case of sound-they are not carried by photons, do not go the speed of light, and are not electromagnetic.  All electromagneic waves go the speed of light, since they are carried by photons.  The only difference between a radio wave and a visible light wave in the frequency of the wave and the energy of the photon (both of which are integrated).
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A pulse of energy - electromagnetic radiation. So anything from radio waves to gamma rays counts as electromagnetic radiation. A pulse of this energy is usually associated with nuclear weapons due to the high intensity of radiation emitted by a thermonuclear reaction.