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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.

2,156 Questions

What is full form X-ray?

There is no full form. They were discovered by accident by a scientist named Wilhelm Röntgen in 1895 while using Cathode ray tubes. As he nor anyone else knew what they were or what they were made of at the time, they were called X-rays. In science and math, X refers to an unknown.


They were also called "Röntgen rays" for a while.

What are the best ways to protect against the effects of exposure to radiation?

Ionizing radiation is "stopped" by passing the radiation through matter which becomes ionized.

By definition, ionizing radiation will ionize material that it passes through. Ionization involves transferring energy, so the entity doing the ionizing loses energy.

That is the simple answer. A closer look reveals greater complexity.

One needs to be clear about language to be accurate in the question and answer.

Normally when referring to ionizing radiation, one is referring to high energy particles that are causing the radiation. Normally, when we say such radiation is "stopped" we mean it is diminished to that the harmful effects are insignificant. One does not "stop" such radiation but rather one causes it to lose energy. There will always be a few stray particles with high energy even after the vast majority have lost so much energy that ionization has stopped occurring.

If one wants to "stop" ionizing radiation, then creating a large enough (thick enough) barrier will effectively reduce the radiation to insignificance. Of course, depending on the nature of the radiation, some materials may be more effective than others in removing the energy from the radiation. Though ionization, i.e. exicting or removing electrons of atoms, is an important energy loss process, there are also processes that involve the interaction of the ionizing radiation with the nuclei of the material through which it passes. Bremsstrahlung is one such process and so is simple transfer of kinetic energy from the incident particle to the particle in the material. These kinds of processes are larger or smaller depending on the mass and energy of the "ionizing radiation" and so an effective discussion of how well a material can "stop" ionizing radiation depends on the ionizing radiation itself.

Does radiation travel through an empty space-?

Yes, radiation can travel through empty space because it consists of particles or waves that do not require a medium to propagate. Examples include electromagnetic waves like light and gamma rays.

What is the minimum wavelength in the visible light spectrum?

The minimum wavelength in the visible light spectrum is approximately 380 nanometers, which corresponds to the color violet.

What are all the radiations?

Radiation is photon or light. We give name for radiation by its' range of wavelength. Those with wavelength < 0.001 nm is called gamma ray, those below gamma to just about 0.1 nm is x-ray and those below x-ray are UV and visible light. Our visible light is light with wavelength 400-700 nm below that are infrered, microwave and radiowave.

What light rays have the longest wavelength?

The longest wavelength photon I could find out about was in a maser (microwave version of a laser) which uses emission between two hyperfine levels of atomic hydrogen. This had a frequency of 1.4 GHz and a wavelength of 21cm.

Which waves in the electromagnetic spectrum are considered high energy waves?

Gamma rays and X-rays are considered high-energy waves in the electromagnetic spectrum due to their short wavelengths and high frequencies. They are capable of penetrating through materials and have the potential to cause ionization in atoms.

Visible wavelengths make up about one-half of the electromagnetic spectrum?

Nope.

-- Visible light has frequencies roughly from 4 x 1014 Hz to 8 x 1014 Hz ... a

range from lowest to highest of 4 x 1014 Hz, or one octave.

-- Let's say that the lowest frequency in the total spectrum is 50 Hz (European

power-line frequency) and the highest is 1019 Hz (lowest freq gamma rays) ...

a total range from lowest to highest of (1019 - 50) Hz, or about 57 octaves.

-- On a linear scale, of the total number of Hz in the spectrum, visible light

covers about 0.004 percent of them.

-- On a logarithmic scale, visible light covers 1 octave out of 57 octaves,

or 1.74 percent of the spectrum.

What causes the difference between the sun and earth's radiation wavelengths?

Unlike Earth and other solid objects, the entire Sun doesn't rotate at the same rate of gas and plasma, different parts of the Sun spin at different rates.

Why Small holes are provided at the bottom of the chimney in an oil lamp?

The small holes at the bottom of the chimney in an oil lamp allow air to flow into the lamp, which is necessary for the combustion process to occur. The air helps to regulate the flame and keep it burning steadily. This design helps improve the efficiency and functionality of the oil lamp.

Why might humans want to gain access to a wider portion of the electromagnetic spectrum?

Access to a wider portion of the electromagnetic spectrum can provide humans with valuable information and capabilities. For example, certain wavelengths allow for improved communication (e.g. radio waves), observation (e.g. infrared and ultraviolet light), and medical imaging (e.g. X-rays). Expanding access to these ranges can lead to advancements in technology, science, and human understanding of the universe.

What percentage is visible light on the electromagnetic spectrum?

Good question-- See the link. Roughly the visible region is 300 nm to 650. so that's 350 nm total. The electromagnetic spectrum goes from 10 Megameters to 1 picometer. So the percentage of the spectrum occupied by visible light is tiny, just 3.5 X 10-9 divided by 10^19 ---- So that's 3.5x10-26 %. So many zeros....! Yikes. Gamma rays (picometers) (10-12)

Hard X-rays

Soft X-Rays

Extreme ultraviolet

Near ultraviolet

Visible light

Near infrared

Moderate infrared

Far infrared

Extremely high frequency (Microwaves)

Super high frequency (Microwaves)

Ultra high frequency (Radio)

Very high frequency (Radio)

High frequency (Radio)

Medium frequency (Radio)

Low frequency (Radio)

Very low frequency (Radio)

Voice frequency (Radio)

Extremely low frequency (Radio) 10 Megameters (10 X 106) Actually the electromagnetic spectrum goes off as far as you want in both directions - there are electromagnetic waves with wavelengths as small as you want, and others as large as you want. So really the answer is 0%. If you meant to ask what percentage of the electromagnetic energy from the sun is visible (for instance) then the answer is nonzero, but I don't know what it is. If you meant to ask a question of the kind that has been answered above (what percentage of the spectrum from 10 megameters to 1 picometer is visible) then the question is not well defined: the answer depends not just on the bounds but on what scale you use. I think the answer above is mistaken. If you go by wavelength, my answer (to that question) would be: 3.5x10-7 divided by 107, which is 3.5x10-14 or 3.5x10-12%. If you use frequency instead of wavelength: The bounds on wavelength given above correspond to 30 Hz to 3x1020Hz, with visible light between 4.6x1014Hz and 1015Hz. Then, the answer would be 5.4x1014 divided by 3x1020, which is 1.8x10-6, or 0.00018%. If you want to use a logarithmic scale, which is more sensible in some ways, then the answer is much higher. I don't know exactly because I don't have a calculator with logarithms here, but it's around 1.5%.

Can radiation turn corners?

Yes, electromagnetic radiation such as light can bend around corners through a process called diffraction. This phenomenon occurs when the wavelength of the radiation is on the same order of magnitude as the obstacle's size. However, the amount of bending is usually limited by the radiation's wavelength.

When was Beta Epsilon Gamma Gamma Alpha Rho Sigma created?

Beta Epsilon Gamma Gamma Alpha Rho Sigma was created on 1923-12-20.

What is the pressure of the inert gas in electric lamp?

It's a fraction of normal atmospheric pressure, but each type of lamp has a particular pressure, depending on the type of gas and the application.

Does polyurethane protect against uv rays from the sun?

Yes, polyurethane coatings can offer some protection against UV rays from the sun. However, over time, prolonged exposure to sunlight can still cause the polyurethane to break down and degrade, resulting in potential discoloration or peeling. It is recommended to use a polyurethane with UV inhibitors for better protection.

Which is the most common use for infrared waves?

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.

Why are electromagnetic waves sometimes called electromagnetic radiation?

because it is the method of translocating energy that has been called radiation.
Radiation is a term that refers to the radius of a sphere meaning that it goes out (propagates) in all three spatial directions equally.

What are properties of emitted radiation?

Ionizing radiation consists of subatomic particles or electromagnetic waves that are energetic enough to detach electrons from atoms or molecules, ionizing them. The occurrence of ionization depends on the energy of the impinging individual particles or waves, and not on their number. An intense flood of particles or waves will not cause ionization if these particles or waves do not carry enough energy to be ionizing. Roughly speaking, particles or photons with energies above a few electron volts (eV) are ionizing.

What force experienced by a mirror when it reflects at the light incident on it from a laser source with a power p?

No , mirror doesnot experience any force while reflecting the light as force is mass to the product of accelaration as photons have no mass the equation becomes 0

;):):):)

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Answer #2:

Answer #1 is internally logical, logically consistent, and consistently wrong.

Nobody ever said that photons have no mass. It's true that they have no

rest-mass, but they're never at rest. They're always traveling at the speed

of light, where they do have mass, as well as momentum and kinetic energy ...

the whole package.

I don't think we can calculate the force on the mirror from the light's power.

But we could if we knew the light's momentum, because we know that the

momentum [vector] must be conserved at the reflection, and since the

direction of the light changes, the mirror must acquire some momentum

to compensate ... in the form of impulse F·t since the mirror is fixed.

What can electromagnetic spectrum tell us about a star?

Information that you can find about the star by looking at its spectra is its luminosity, surface temperature, its type(common/rare), color, how/if a star is moving, the density, the size, and future of the star.

2. And looking for spectral lines informs as to what elements are present.

What is the major difference between lanthanides and actinides?

Generally speaking, the lanthanides are naturally occurring and stable, although relatively uncommon. The actinides are naturally occurring through uranium; after that, they're synthetic, and all are unstable (radioactive.)

What is the frequency of 486 nm light?

Just divide the speed of light - c - by the wavelength.

So it's 2.99792458 x 108 / 4.86 x 10-7 and the answer is in Hz.

What can detect em waves?

If you take a bearing of position 2 using a compass at position 1

then take a bearing of position 1 from position 2 then they should be reciprocals

180 degrees difference if there is any other magnetic field apart from earths then there will be a difference other than 180 degrees.

What does the intensity of a beam of em radiation mean?

The intensity of a beam of electromagnetic radiation is a measure of the power per unit area that is carried by the radiation. It quantifies how much energy is transferred through a given area in a given amount of time. The higher the intensity, the greater the amount of energy being transferred.