what is electromagnetic spectrum?

Answer 1

The electromagnetic spectrum is the whole range of electromagnetic radiation, also known as light or photons. Photons come in many different wavelengths/frequencies. Wavelengths and frequencies are inversely proportional, such that a large wavelength means a low frequency, and vice-versa. Think of a light wave as a side view of the ocean. The ocean has lots waves, each wave has a crest and a trough. The distance between two adjacent crests is known as the wavelength. Since light waves always move at a set speed (300,000,000 meters per second), the frequency is the amount of times in a second that a wave crest will pass by a set location. So when you tune your radio to 99.5 KISS to listen to some good rock, you are actually tuning your radio to 99.5 Megahertz (MHz) meaning that the electromagnetic radiation that your radio is picking up will be hitting you with 99,500,000 crests and troughs in each second.
Electromagnetic radiation frequency variations can also be visible. When you see a white light bulb, the bulb is emitting all the frequencies of visible light. Add a red filter and only the lower frequencies of light can pass through.
An infrared camera looks at light that is not visible to our eyes. The heat given off by you or me is detectable by this camera, or by snakes (who can see heat), but not by our eyes.
The lower the energy of the emitter, the lower the frequency of the light that is emitted. Using a high energy emitter, an X-Ray tech can pass high energy x-rays through your body. The low density tissues allow the x-rays to pass through uninhibited. The higher density bones block and deflect the x-rays, showing up on the x-ray film as white portions that did not receive the x-rays. As you may know, this is a useful tool to doctors for looking at our bones and insides without physically opening us up.
Take a look at your microwave in your kitchen today. You will see that it has a metal plate on the door with a bunch of holes in it. The holes are sized so that visible light waves may pass through easily between the gaps such that you can watch your hot dog explode and make a mess, while not cooking your face while you watch. Microwaves, despite what the name implies, have a longer wavelength than visible light, and therefore need a larger hole to travel through than the holes that are on your microwave.
I hope that this explanation is useful to you in understanding how the electromagnetic spectrum affects our everyday life.

Answer 2

Energy can travel from one place to another by radiation or more specifically electromagnetic radiation. For example, sunlight comes to earth by this process. This radiation is like a wave. Radiation of energy occurs at different wave length or frequency. Each color of light we see has a different wave length. The forms of energy we can't see, like X-rays, Gama rays, UV rays and infrared rays also have different wavelengths from each other. All the different wave lengths of energy together is called electromagnetic spectrum.

* If you want long and complecated answers, you will prefer the other answers below. But if you just wanted the idea, you should be satisfied with my answer.
Hope this was helpful.

Answer 3

(m)

The electromagnetic (EM) spectrum is the range of all possible electromagnetic radiation. Also the "electromagnetic spectrum" (usually just spectrum) of an object is the frequency range of electromagnetic radiation with 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 short wavelength limit is likely to be the Planck length, and the long wavelength limit is the size of the universe itself (see physical cosmology), though in principle the spectrum is infinite.

Electromagnetic energy at a particular wavelength λ (in vacuum) has an associated frequency f and photon energy E. Thus, the electromagnetic spectrum may be expressed equally well in terms of any of these three quantities. They are related according to the equations:

wave speed (c) = frequency x wavelength

Answer 4

mild is a variety of ability it travels as QUANTA. i.e. ability in discrete tiny packets. mild could be the two a wave or a particle reckoning on what undertaking it fairly is in. look at 2 stable examples of this -: The photograph-electric powered consequence (behaves as a particle because it may unlock a single electron from a steel fabric) - it is basically based on the intensity of the mild and varies linearly with frequency. however the opposing part is De Broglie, who got here across the wave like residences of sunshine. Small debris are very comparable and would show bothe wave-like and particle-like residences. that's an exciting quaestion pondering I lecture in Atomic & Nuclear Physics. attempt a Google seek for Wave-Particle Duality and you will locate plenty and a number of of techniques. The seen spectrum is from 400nm to 700nm (4 hundred being Violet and seven hundred being crimson) an prolonged wavelength shows a decrease frequency and consequently much less ability, this comes from the equation E = h f the place-: E = ability h = planck's consistent f = frequency This says that the flexibility of sunshine relies upon basically upon the frequency of it. If we pass extra up the EM spectrum to X-rays and Gamma's - those have particularly small wavelengths and extremely extreme frequency (i.e. remember velocity of sunshine = frequency x lambda) so as that all of them commute with a similar velocity - purely some have extra ability than others. Line spectra is dependant upon the allowed ability tiers interior a particular atom. Neil's Bohr who postulated the habit of the Hydrogen atom stated it ought to have discrete ability tiers - and this has been shown by employing emission spectra of Hydrogen and just about another element. (See the links for Emission Spectra - the 2d hyperlink is very stable)

Answer 5

Electromagnetic radiation is composed from an oscillating electric and magnetic field orthogonal and also perpendicular to the direction of propagation. Their velocity is c an universal constant approximately 310^8 m/s

their domain goes from the least energetic (radiowaves with a wavelength of several hundred of meters ) to the most energetic cosmic rays wavelength 10^-12m

their scale is radiowaves wavelength> 1m
microwaves 1m
infrared wavelength > 800nm
visible 400 to 800 nm
ultraviolet 10nm to 400nm
X-rays lower than 100nm
gamma rays lower than 1nm
cosmic rays

The boudary must not be taken strictly except for visible domain

Answer 6

I will attempt the short answer. You know what electricity and magnetism are, right? Well, as it turns out, they both cause each other. It is the movement of tiny particles called photons that cause the attraction and repulsion we see with electricity and magnetism. Well, these particles can exist as waves (specifically, light waves). Waves have qualities like wavelength and frequency. By varying these, you get different visible colors (and nonvisible as well). The electromagnetic spectrum simply refers to the whole range of wavelength of light. For a picture showing it, go here:

http://upload.wikimedia.org/wikipedia/en/8/8a/Electromagnetic-Spectrum.png

Answer 7

Remember- Radiowaves
My-Microwaves
Instructions-Infrared
Visible-Visible Light
Under-Ultra Violet
X-ray-X-ray
Glasses-Gamma rays

Answer 8

The electromagnetic radiations are stream of photons travelling in waves through vacuum. That is, they don’t need any medium to travel unlike sound waves. An electromagnetic spectrum consists of all forms of electromagnetic radiations arranged from lowest energy (longest wavelength) to highest energy (shortest wavelength).
· The low frequency radio waves are not visible to our eyes and mainly used for communication. They transmit audio signals to radios, audio and video signals to our televisions and signals to our cell phones. Prolonged exposure to these waves has an impact on our health.



· Microwaves are used for cooking food, satellite transmissions and by radars used in aircrafts.



· Infra Red or IR rays lies just below the visible light. They are used in TV remotes for changing channels. Heat given out by IR rays is used in therapies in healing body pain and injuries.



· Only part of the EM spectrum that is visible to our eyes is Visible light. The lamp that glows in our houses, the white light from sun all fall under visible range of frequencies.



The radiations that have higher energy levels are dangerous. Large doses of these radiations can damage the retina in the eyes, cause cancer and leukemia.



· Ultraviolet or UV rays are needed by our body to synthesize vitamin D. Hospitals use UV rays to sterilize surgical equipments and kill microbes.



· X-rays are high frequency rays that are very much useful in medical field to examine inner parts of our body.



· Gamma rays are used in industry to inspect welds.