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dolimitless
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Where does electromagnetic radiation come form?
Does it all start from the sun, traveling to earth, that powers all the chemical processes that release electromagnetic radiation to power everyday
life?
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watson.fawkes
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Quote: Originally posted by dolimitless  | | Does it all start from the sun, traveling to earth, that powers all the chemical processes that release electromagnetic radiation to power everyday
life? |
No.
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setback
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Earth's magnetic field is produced by the hot iron core of our planet.
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Sedit
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Electromagnetic radiation is formed when an electron drops from a higher orbital level to a lower one with the frequency emited being determined by
the level of the drop.
Knowledge is useless to useless people...
"I see a lot of patterns in our behavior as a nation that parallel a lot of other historical processes. The fall of Rome, the fall of Germany — the
fall of the ruling country, the people who think they can do whatever they want without anybody else's consent. I've seen this story
before."~Maynard James Keenan
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dolimitless
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| Quote: Originally posted by Sedit | | Electromagnetic radiation is formed when an electron drops from a higher orbital level to a lower one with the frequency emited being determined by
the level of the drop. |
And what causes it to go from the lower energy level to the higher energy level in the first place? Is it not by heat, collisions (cause by an
increase in heat?) or excitation by exisitng photons?
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dolimitless
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I think I found the correct answer, so perhaps I was partially correct to a certain extent:?
The main source of electromagnetic energy is the sun, but man-made sources account for large amounts of the electromagnetic radiation in our
day-to-day environment. Items such as hairdryers, electrical ovens, fluorescent lights, microwave ovens, stereos, wireless phones and computers
produce electromagnetic fields of varying intensities. Any object with a temperature above absolute zero (-273° Celsius) radiates (emits) this type
of energy to their surrounding environment.
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The Fountain of Discordia
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Electromagnetic radiation is IMHO a misnomer. A more correct name for it would be Electronic Radiation(again, IMHO), not in the common sense
of Electroinc devices, but in the sense of Electrons. Electronic radiation occurs when an electron is forced into a higher energy level. It is not
stable at that level, and thus decays by releasing a photon or a series of photons(see additional info under the edit) untill it reaches the first
energy level that is either half filled or has a filled one directly below it, with the first rule having lower priority than the second one(ie. If
there are 2 filled and 2 half-filled energy levels for the electron to occupy,it will fill the half filled one closest to the filled one and thus the
nucleus, and thus the lowest possible energy state.). At this point the Pauli Exclusion Principle stabilizes the electron such that no further
radiation is emitted.
EDIT:
The amount of levels jumped down determines the freqeuncy of the radiation, ie. if an electron drops sixty levels at once, it's a gamma ray, if it
drops ten at a time it's a radio ray. (I pulled those numbers out of my ass, and they ARE incorrect & only useful as a hypothetical device to
iluustrate the basic concept)
[Edited on 23-6-2009 by The Fountain of Discordia]
Chemistry is art by other means.
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bdgackle
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Electromagnetic radiation comes from accelarating charged particles. Take an electron or proton and accelerate it, it radiates. Wiggle it back and
forth (basically accelerating it over and over), and it radiates continously. That's how a radio works -- literally by wiggling electrons in the
anntenae back and forth.
You can also get radiation from simply heating something up. Think of the glowing you see from very hot metal. Google "blackbody radiation" for an
explaination -- this one played a very important part in the history of physics.
If you mean what causes the background radiation we are all bathing in, it's a combination of the sun and man-made sources. Which is the larger
contributer depends on wavelength -- I believe that in the RF range, the Earth outshines the sun, thanks to humans, but don't quote me on that. The
man-made radiation is ultimately powered by one of two sources: trapped solar energy in chemical or other form, or nuclear energy from
fissable/fusable elements in the Earth's crust. Geothermal counts as the latter variety -- hot rocks keep the core of the earth warm, not the sun.
There is also a component to background noise that comes from the rest of the universe -- everything from other stars to echos from the big bang.
As for the name, it's called "Electromagnetic" radation because both field types are present -- changing electric fields lie perpendicular to changing
magnetic fields. One causes the other, over and over. It's as close as you will ever get to perpetual motion in nature, and the speed that one
reacts with the other determines the speed of light -- in essense defining the very concept of time as we know it.
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pneumatician
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after milions of years how iron is hot in the core????
If I put an iron piece red hot in the summer hot sun the iron cold anyway in a few minutes...
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DraconicAcid
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| Quote: Originally posted by pneumatician |
after milions of years how iron is hot in the core????
If I put an iron piece red hot in the summer hot sun the iron cold anyway in a few minutes... |
Things cool down more quickly at the surface than the centre. Also, the earth has lots of radioactive elements, which give off heat as they decay,
slowing down the cooling of the earth (as was explained to Lord Kelvin a century or two ago).
Please remember: "Filtrate" is not a verb.
Write up your lab reports the way your instructor wants them, not the way your ex-instructor wants them.
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arkoma
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My brain breaks every time I try to wrap my head around fields. I was a radio tech in the USMC in the early 80's--I can build a good antenna from
scratch, but how in the HELL does the EMF just gooooo from a resonant element?@!*%?
"We believe the knowledge and cultural heritage of mankind should be accessible to all people around the world, regardless of their wealth, social
status, nationality, citizenship, etc" z-lib
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violet sin
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In my head, mind you, it's more and more like a newton's cradle, you know thebstrung up balls what transfer energy to the ends, as you approach a
resonate length/dimension of the antenna. They are bopped off relative to the field strength on the particular cycle. So in effect, don't you load
the electron cloud like a spring, and release it to leave them wobble about viciously. In unison. Why your driven element is proportional to
reflective and dead/passive elements in dimensions and spacing. Participating in steering the field bound in metal sticks.
Well that's one viewpoint I guess. My father is a ham operator. It's not always easy understanding the stuff he's learned. It was arrived at from
different approaches to the same idea, than I can relate to from my knowledge base. But I try lol
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pneumatician
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| Quote: Originally posted by DraconicAcid | Earth's magnetic field is produced by the hot iron core of our planet. [/rquote]
after milions of years how iron is hot in the core????
If I put an iron piece red hot in the summer hot sun the iron cold anyway in a few minutes...[/rquote]
Things cool down more quickly at the surface than the centre. Also, the earth has lots of radioactive elements, which give off heat as they decay,
slowing down the cooling of the earth (as was explained to Lord Kelvin a century or two ago). |
you really believe this? :.)
After MILIONS of years iron is in red hot state including some glacial epochs? ok guy.
hey, of course, everyone is free to believe in their own disneyland, good luck 
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DraconicAcid
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| Quote: Originally posted by pneumatician | | Quote: Originally posted by DraconicAcid | Earth's magnetic field is produced by the hot iron core of our planet. [/rquote]
after milions of years how iron is hot in the core????
If I put an iron piece red hot in the summer hot sun the iron cold anyway in a few minutes...[/rquote]
Things cool down more quickly at the surface than the centre. Also, the earth has lots of radioactive elements, which give off heat as they decay,
slowing down the cooling of the earth (as was explained to Lord Kelvin a century or two ago). |
you really believe this? :.)
After MILIONS of years iron is in red hot state including some glacial epochs? ok guy.
hey, of course, everyone is free to believe in their own disneyland, good luck
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Do you have any idea how thick the world is?
Please remember: "Filtrate" is not a verb.
Write up your lab reports the way your instructor wants them, not the way your ex-instructor wants them.
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Sulaiman
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AFAIK the core is continuously heated by radioactive decay of heavy isotopes and heat loss is reduced by the mantle.
The greenhouse effect also helps to keep Earth warm.
If the core were not liquid there would be no tectonic plate movements.
CAUTION : Hobby Chemist, not Professional or even Amateur
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arkoma
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Without a dynamo in the core we wouldn't have this and would have all been fried by the solar wind.
"We believe the knowledge and cultural heritage of mankind should be accessible to all people around the world, regardless of their wealth, social
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TheMrbunGee
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| Quote: Originally posted by pneumatician |
you really believe this? :.)
After MILIONS of years iron is in red hot state including some glacial epochs? ok guy.
hey, of course, everyone is free to believe in their own disneyland, good luck
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Unexpected ignorance in this forum. :O
Try to put Your hot piece of iron within several thousands km thick molten rock and see how many minutes it will take too cool off. When that is done
add radioactivity and huge pressure. See what happens. (You can do this in Your mind, of course. Just comprehend the actual size of this planet.)
It also does not get freezing cold even few meters under ground, not even in harsh winters, hence - basements, where people keep all their
deliciousness so they won't freeze. Earth is not the best conductor of heat.
And it is billions, not millions of years.
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wg48temp9
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Its been known for some time from deep mines and bore holes that the ground temperature increases with depth. That increase with depth of about 25C
per kilometer suggested the core of the earth is at thousands of degrees.
From:
https://energyeducation.ca/encyclopedia/Geothermal_gradient#:~:text=The%20Earth%20gets%20hotter%20as,Earth's%20temperature%20increases%20with%20depth.
&text=On%20average%2C%20the%20temperature%20increases,for%20every%20kilometer%20of%20depth.
At the usual depth of cellars, near surface caves or mines the temperature is close to the average surface temperature ie warm in winter or even at
night and cool in summer or during the day, a lot like a thick walled stone cottage.
Its also known from seismology that the core is mostly liquid because only compression waves from earthquakes and underground explosions pass through
it.
[Edited on 10/5/2020 by wg48temp9]
I am wg48 but not on my usual pc hence the temp handle.
Thank goodness for Fleming and the fungi.
Old codger' lives matters, wear a mask and help save them.
Be aware of demagoguery, keep your frontal lobes fully engaged.
I don't know who invented mRNA vaccines but they should get a fancy medal and I hope they made a shed load of money from it.
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pneumatician
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expected parroting of the official bullshit in this forum. :-D
exist many other theories, nobody can prove the official shit so any other theorie have the equal value no matter from who come from if from a sacred
cow or a illiterate as long as it sounds consistent, logical, and reasonable. if you do not want or can accept them is your problem.
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DraconicAcid
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| Quote: Originally posted by pneumatician | expected parroting of the official bullshit in this forum. :-D
exist many other theories, nobody can prove the official shit so any other theorie have the equal value no matter from who come from if from a sacred
cow or a illiterate as long as it sounds consistent, logical, and reasonable. if you do not want or can accept them is your problem.
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Such bravery in the face of the scientific establishment! Why don't you tackle the atomic theory of matter, and come up with a new alternative to
that?
Please remember: "Filtrate" is not a verb.
Write up your lab reports the way your instructor wants them, not the way your ex-instructor wants them.
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TheMrbunGee
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| Quote: Originally posted by pneumatician | expected parroting of the official bullshit in this forum. :-D
exist many other theories, nobody can prove the official shit so any other theorie have the equal value no matter from who come from if from a sacred
cow or a illiterate as long as it sounds consistent, logical, and reasonable. if you do not want or can accept them is your problem.
|
There is evidence and conclusions can be made based on it. If You think science is about fooling people, I am afraid You are registered in wrong
forum.
If You have any cool ideas go ahead, spill them, we can discuss. If You cannot comprehend something it does not mean it is false. You have not spent a
dime of Your time researching this topic, and You think that people, that has spent most of their lives researching Earths structure are wrong, based
on a piece of metal You heated once. And thousands of scientists that do this every day are not complaining about these facts.
It is completely OK to not know things, but You keep Your uneducated guesses to Your self or make it clear, that is Your uneducated guess. You can ask
questions and be skeptical, I encourage that.
A nice explanatory video for You to check out, find out how measurements are made. Do Your own research from sources with references. Please.
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arkoma
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where do these trolls come from? yeah you, pneumatician
*edit* a good way to avoid the "official bullshit" would be to NOT log in maybe?
[Edited on 10-6-2020 by arkoma]
"We believe the knowledge and cultural heritage of mankind should be accessible to all people around the world, regardless of their wealth, social
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B(a)P
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| Quote: Originally posted by pneumatician | expected parroting of the official bullshit in this forum. :-D
exist many other theories, nobody can prove the official shit so any other theorie have the equal value no matter from who come from if from a sacred
cow or a illiterate as long as it sounds consistent, logical, and reasonable. if you do not want or can accept them is your problem.
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Curios about your theory on volcanoes? How they form, where does all that molten rock come from?
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Gearhead_Shem_Tov
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| Quote: Originally posted by B(a)P |
Curios about your theory on volcanoes? How they form, where does all that molten rock come from? |
Volcanoes are all either at or near tectonic plate boundaries or above plumes of hot rock in the mantle (so-called "hotspots").
The boundary variety come about because one plate has collided with another and is "diving" beneath it. This is called subduction. The plate being
subducted is under the ocean, and the plate it is subducting under is continental crust. The oceanic plate thus carries lots of water with it. This
water acts to reduce the melting point of the rocks being carried down. The flowing rock of the plate is solid at first, and it doesn't melt until it
has been carried some distance under the continental plate.
Once the rock has been brought deep enough, though, some of it does liquify forming magma. This magma has lower density than the still solid rock
around it, so it slowly begins to rise through the rock of the overlying continental margin. Eventually it rises so far that it exerts enough pressure
on the thinning crust to form cracks and erupt to the surface. The first lava flows at the surface begin to create the body of a classic conical
volcano. The details differ depending on the exact chemistry of the rocks melted to form the magma, but this is why active volcanoes are found mostly
on the margins of continents. Mt St Helens is a prime example.
The other type of volcano is responsible for building up new islands in ocean plates travelling over those mantle plume hotspots mentioned earlier.
Their geochemistry is such that they form shield volcanoes where the magma has much lower viscosity and spreads more horizontally than is the case
with continental volcanoes. The Hawaiian Island chain is a good example which illustrates that the hotspot plume responsible seems to stay more or
less stationary while the marine plate travels over it, leaving a chain of extinct island volcanoes no longer directly above the plume.
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B(a)P
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| Quote: Originally posted by Gearhead_Shem_Tov | | Quote: Originally posted by B(a)P |
Curios about your theory on volcanoes? How they form, where does all that molten rock come from? |
Volcanoes are all either at or near tectonic plate boundaries or above plumes of hot rock in the mantle (so-called "hotspots").
The boundary variety come about because one plate has collided with another and is "diving" beneath it. This is called subduction. The plate being
subducted is under the ocean, and the plate it is subducting under is continental crust. The oceanic plate thus carries lots of water with it. This
water acts to reduce the melting point of the rocks being carried down. The flowing rock of the plate is solid at first, and it doesn't melt until it
has been carried some distance under the continental plate.
Once the rock has been brought deep enough, though, some of it does liquify forming magma. This magma has lower density than the still solid rock
around it, so it slowly begins to rise through the rock of the overlying continental margin. Eventually it rises so far that it exerts enough pressure
on the thinning crust to form cracks and erupt to the surface. The first lava flows at the surface begin to create the body of a classic conical
volcano. The details differ depending on the exact chemistry of the rocks melted to form the magma, but this is why active volcanoes are found mostly
on the margins of continents. Mt St Helens is a prime example.
The other type of volcano is responsible for building up new islands in ocean plates travelling over those mantle plume hotspots mentioned earlier.
Their geochemistry is such that they form shield volcanoes where the magma has much lower viscosity and spreads more horizontally than is the case
with continental volcanoes. The Hawaiian Island chain is a good example which illustrates that the hotspot plume responsible seems to stay more or
less stationary while the marine plate travels over it, leaving a chain of extinct island volcanoes no longer directly above the plume.
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Thanks, that is also the understanding I had :-). I posed the question in response to the claim from @pneumatician that the centre of the earth is not
hot.
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