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Electromagnetic Radiation

Electromagnetic (EM) radiation is the energy transmitted through space or a material medium in the form of electromagnetic waves. The frequency range of such waves is tremendous, and is shown by the electromagnetic spectrum. These waves include radio waves, microwaves, infrared waves, visible light waves, ultraviolet (UV) waves, X-rays, and gamma rays.

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Which is the most common use for infrared waves?

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Asked by Wiki User

Infrared light is even used to heat food sometimes - special lamps that emit thermal infrared waves are often used in fast food restaurants! Shorter, near infrared waves are not hot at all - in fact you cannot even feel them. These shorter wavelengths are the onesused by your TV's remote control.

What are the uses for ultraviolet light?

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It can be used for helping insects find plants, and medical scanning.

Why is Serratia marcescens more susceptible to ultraviolet radiation than Bacillus cereus?

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UV radiation exposure to S. marcescens colonies results in DNA mutations. The radiation energy is absorbed by the bacteria and if exposure is long enough, thymine nitrogenous bases adjacent to each other in DNA strands will form cyclobutane rings called thymine dimers. When replicating DNA and multiplying, the enzymes responsible for replication will bond a different base in place of the thymine bases and a mutation will result. How if affects the DNA, and consequently protein synthesis, is entirely dependent on the location of mutations.

Is there a material that is transparent to infrared radiation but opaque to visible light?

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Asked by Wiki User

ICE. You are standing behind ICE wall. I can see you but I can not use a infrared camera for taking your photo. For that matter, ordinary glass does a pretty good job of blocking certain wavelengths of infrared.

How does the electromagnetic spectrum arrange different types of radiation?

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Asked by Wiki User

Yes. The different types are determined by their wavelength. We have assigned 7 commonly-used names to the different wavelengths (although within each type, you can get more wavelengths, as it is a continuous scale). The names are, from long wavelengths to short:

Radio Waves, Microwaves, Infrared, Visible Light (the one we can see with our eyes), Ultraviolet, X-rays, and Gamma Ways (γ-rays). Ultraviolet, X-rays and gamma rays are ionizing, which means they can add or remove electrons from atoms, which can change the way they react. This is why they are dangerous.

Infrared, microwaves and radio waves are not ionizing. They have longer wavelengths and less energy. Radio waves can have wavelengths of hundreds of meters, and visible light has wavelengths on the order of nanometers.

What causes shadow length?

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Asked by Wiki User

The length of an object's shadow is determined by ...

-- the length of the object,

-- the angle between the object's length and the surface on which

its shadow appears,

-- the distance between the object and the surface on which

its shadow appears,

-- the angular size of the light source as seen from the object,

-- the angle between the direction to the light source and the

normal to the object.

Examples of mechanical and electromagnetic waves?

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Asked by Wiki User

Some examples of mechanical waves are Sound, waves in a slinky, and water.

Mechanical waves need matter to move.

Some examples of electromagnetic waves are Radio, Gamma, X-rays, Infra-red, and Microwaves

Electromagnetic waves are able to travel through a medium of liquids, solids, and geaseous states,

or through space where there is no material at all, called "vacuum".

What is the frequency of an electromagnetic wave that has a wavelength of 300000 kilometers?

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Asked by Wiki User

The formula related to frequency and wavelength is

Wavelength = 300000000 / Frequency (f)

Wavelength = 300000000 / 30000000000

Wavelength = 1/100

Wavelength = 0.01 meter

OR

Wavelength = 10 milimeter

Is there a maximum theoretical frequency for electromagnetic waves?

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Asked by Wiki User

Yes, there is maximum theoretical frequency for EM (electromagnetic) waves. In the EM Spectrum, the highest frequency band is of gamma rays, which consist of frequencies greater than 1x10**19 Hz and wavelenth less than 0.1 A0.

The three equations (shown below) explain all manner about EM waves:

Where:

  • c = 299,792,458 m/s = the speed of light in vacuum,
  • h = 6.62606896 (33) * 10**-34 = Planck's constant,
  • J s = 4.13566733 (10) * 10**-15,
  • eV s = ?

This holds good for the (above) equations until this criteria breaks down, then theoretical conditions become indeterminate (collapse).

The lower EM boundary is Extremely Long Waves and these consist of frequency below 106 Hz, and wavelenth exceeding 1000 A0 (the criteria for Maximum EM Waves) .

What is a Scalar Energy Weapon?

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Asked by Woody1421

Scalar Energy is an esoteric synonym for Static Electricity,

which was the kind of electricity most familiar before Batteries,

Power Plants, Electric Lamps, and is generally considered useless,

BUT, since static electricity machines can be made of Non-Metallic

parts, demonstrations of it seem magical, and using the term

Scalar Energy in commerce is usually associated with fraud,

and claims of new perpetual motion machines. Static electricity

can produce convincing and even useful free power for small lamps

and motors, but generally requires more space than Solar Panels

for the same output, only having any advantage at night time.

Amazing voltage gains are possible with electrostatic machines,

some of which produce Lightning, and in the case of a Van De Graaf

generator, may be confused with a Tesla Coil, which uses another

uncommon form of electromagnetism (High Frequency AC) for

similar Lightning and Spark effects. New secret inventions using

"Scalar Energy", supposedly needing funding for research, are

a common scam.

Amber is called an electret (electricity magnet) because it is non-metallic, and can be electrified (charged) to attract or repel

other non-metallic objects, just like a magnet has been magnetized

and attracts or repels metallic objects. It may follow then, that

Amber (or other "electrets") may be sold for health or magic

in the same way magnets sometimes are. (I do not know how magnets

or electrets affect health.) The word "Electricity" is based on an ancient (Greek or Latin) word meaning "Amber".

What is The structure of a wave?

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Asked by Wiki User

In general term a wave is generated by an oscillating physical quantity when the oscillation propagates following the so called wave equation.

When the oscillation starts the wave start to propagate:: in this transient situation the wavefront is the set of points that are reached by the wave at the same time. In general, due to the continuity of physical phenomena, the wavefront is a regular surface, but its shape changes in time.

The wave propagation direction in a particular point is perpendicular to the wavefront passing from that point.

The frequency spectrum of the wave is composed by all the frequencies whose power is not null (in light waves generally we call the frequency "colors" thus the frequency spectrum of a light wave is composed by all the colors that are present in the wave. If the frequency spectrum of the wave is composed by a a single powerful frequency with a set of side frequencies much less powerful, the wave is called monochromatic and the prevalent frequency is called wave frequency (a similar light wave is seen of a well specified color, for example red or green).

Each frequency that is present in a wave can be associated with a purely monochromatic wave, that is a wave constituted by that frequency only. Thus a wave can be represented as a superposition of monochromatic waves.

When the wave is created, every monochromatic wave has its own wavefront and its own velocity, that is different from frequency to frequency (that is in a light wave in air or in glass every color has a different speed). The speed of a single frequency is called phase speed and the fact that each frequency has a different speed is called wave dispersion. Sometimes there is no dispersion, that is all the frequencies have the same speed. This is the case of light in vacuum: the speed of every color of light in vacuum is generally simply called light speed.

When dispersion is present, the overall wave (composed by all the frequencies) proceeds with a collective speed that can be obtained by the frequency spectrum of the wave and by the speed of each frequency (also called dispersion relation of the wave) and that is called group speed of the wave.

The wavelength of each frequency component of the wave is obtained by dividing the speed of that frequency component by the frequency itself. In a purely periodic and monochromatic wave (that is a wave repeating itself at fixed time intervals and with a spectrum reduced to a single frequency) the wavelength is the distance in space along the propagation direction at which the wave value is the same in every moment.

The amplitude of the wave for a frequency and in a certain point is the value of the frequency spectrum in that point, that physically is the square root of the power transported by the considered frequency component of the wave through a unitary surface around the considered point. The total power that the wave transport through a given surface in space is the sum of the power transported by each individual frequency.

The phase of a frequency component of the wave in a point can be calculated by evaluating the value of that component in the initial instant (t=0), dividing by the amplitude and calculating the inverse sin of the obtained number (arcsin() ).

What is unit of electromagnetic spectrum?

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Asked by Wiki User

electromagnetic spectrum can be interpreted in the units of frequency i.e. hertz or in the units of wavelength i.e nm

What is net radiation surplus?

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Net radiation, or net flux, is the balance between the incoming and outgoing energy here on Earth. It is the amount of energy that has influence over the climate.

Are X-rays visible light?

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Asked by Wiki User

No, x-rays are not visible light.

Can be felt as heat from an incandescent light bulb?

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Asked by Wiki User

Yes, incandescent light is produced directly by heating a filament so hot that it glows, in accordance with cavity radiation laws. The energy to heat the filament comes from the electricity passing through it.

What if your skin temperature is about 300K in what region of the electromagnetic spectrum do you emit thermal radiation most intensely?

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Asked by Wiki User

As

lemda{max} T = constant = 2898 u m K

lemda{max} = 2898 u m K / T

lemda{max} = 2898 u m K / 3OOk

lemda{max} = 2898 u m K / 3OO

lemda{max} = 9.66 u m

in infrared region

What is the main type of electromagnetic that makes up the solar radiation that reaches earth?

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Asked by Wiki User

Well techinichally it is just a radiation that comes from the sun and the readiation is a electromagnetic field

What is a packet of electromagnetic radiation called?

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The packet of electromagnetic radiation is the photon.

What is the difference between bremsstrahlung and characteristic radiation?

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Bremstrahlung is German for "braking radiation." It refers to radiation that is associated with the positive or negative acceleration of charged particles. The energy of the emitted photon equals the loss of kinetic energy of the particle. Characteristic radiation refers to groups of discrete wavelengths characteristic of the emitting element.