What are the benifits of microwaves cosidering emf?
93660
EMF can mean electromagnetic field or electromotive force. I assume you mean the former. \n\nThere are lots of uses and potential uses for microwave radar waves:\n\n1. heating food\n2. radar guns for police\n3. communications\n4. disabling electronics\n5. radar systems for planes, weather, etc\n6. crash avoidance systems for cars and trucks\n7. traffic monitoring\n8. astronomy\n9. surface mapping by satellites\n\nand so on.
669941
I don't see any correlation of electro-magnetic radiation and global warming at all.  Honestly, I am not even sure that we as human beings have caused what we call 'global warming'.  Every day scientists discover more and more natural patterns on this planet, some of them hundreds of years to work full swing.  This entire 'global warming' may be a 1000 year 'pattern' that we have just yet to discover because we have insufficient data (aka, haven't been measuring it long enough).\n\nBut EMF or EMR having an effect on it?  No, I don't think so.\n\nJust my .02 worth.
1026790
When you microwave things you let off electro-magnetic radiation. That is why you want to check the seal on your microwave occasionally because if this leaks it is very harmful. Microwave radiation puts you at risk for cancer.\n\nTen reasons to throw out your Microwave oven (taken from research): \n\n1. Continually eating food processed from a microwave oven causes long term, permanent, brain damage by ‘shorting out” electrical impulses in the brain (de-polarizing or de-magnetizing the brain tissue).\n2. The human body cannot metabolize (breakdown) the unknown by-products created in microwaved food.\n3. Male and female hormone production is shut down and/or altered by continually eating microwaved foods.\n4. The effects of microwaved food by-products are residual (long term, permanent) within the human body.\n5. Minerals, vitamins, and nutrients of all microwaved food is reduced or altered so that the human body gets little or no benefit, or the human body absorbs altered compounds that cannot be broken down.\n6. The minerals in vegetables are altered into cancerous free radicals when cooked in microwave ovens.\n7. Microwaved foods cause stomach and intestinal cancerous growths (tumors). This may explain the rapid increased rate of colon cancer in America.\n8. The prolonged eating of microwaved foods causes cancerous cells to increase in human blood.\n9. Continual ingestion of microwaved food causes immune system deficiencies through lymph gland and serum alterations.\n10. Eating microwaved food causes loss of memory, concentration, emotional instability, and a decrease of intelligence.
5847
Well at the moment the frequency that microwaves use (2.4GHz) is the best one for wireless. But in about a year (or two) wireless will be using better frequencies that don't interfere with phones. For now you can get 802.11a routers and cards which work on a lower frequency. The one drawback of those is that they interfere with older phones and the speed is slower.
800950
Microwaves and ocean waves share one common characteristic:\nIt is the transfer of energy through a medium.  The waves have a variable intensity.  For a microwave it is electromagnetic energy traveling at the speed of light with a frequency in the giga-hertz range.  For an ocean wave is the transfer of mechanical energy at a frequency of 1 per 30 seconds or so.  The height of the wave is proportional to the amount of energy and the depth of the water.\n\nIn the case of communications, the microwave energy is modulated to transmit information according to the modulation protocol and frequency.\n\nI hope that helps.\n\nBy the way, microwave energy is used in microwave ovens because the frequency of the microwave causes the water molecules in the food to react and heat.  This is because the water molecule is a bipolar molecule with a resonanat frequency that gets matched up to the microwave and thus converts the electromagnetic energy into kinetic energy, which gets converted to heat.\n\nj
787222
if you turn on the laser, the effect depends on the stenght of the laser. The average person probably could not get a laser stong enough to do any real damage. If you turn on the microwave, you will get sparks and bangs from the metal compenents of the laser. It probably will not work after the exerience, but only because the compenent will have moved. Mircowaves are not likle to be the right wavelength to case the stimulated emission nessary to make the laser work.
994708
There have been many proposals using beamed electromagnetic waves to transfer significant power, but none have been implemented on a large scale.  The proposals typically suggested a solar power energy transmitting satellite in orbit that sends microwave energy to energy receiving stations on earth.\n\nMost digital radiowaves (WiFi, digital TV, and others) are quite low power at the receiver.\n\nOne problem with "more energy through a coil" is that the reactance of a coil increases directly with frequency, and you may get more VOLTAGE but less CURRENT, so the amount of POWER won't have increased.  \n\nNikoli Tesla had a proposal to use high frequency power transmission by radiation rather than conduction, but it proved impractical, as the received power density decreases as the square of the distance from the transmitter (source), while conducted power loss in transmission lines varies directly with the distance.
662527
Microwaves do emit radiation, but, true to their name, the radiation is in the form of micro-waves.  These waves lack the power to penetrate skin.  \n\nThe heat is of a worse danger, as testicles require a temperature lowere than that of the rest of the body, but I doubt that that is a concern so long as the door is closed and you yourself are not directly within the source of heat.  \n\nEven with that concern, men produce so much sperm each day that it is unlikely that you would be rendered infertile.\n\nI do believe that your reproductive future is safe.
164160
One of the basic characteristics of microwave energy is that it is reflected by metal. The extent to which microwaves are reflected varies with the type of metal. For example, aluminum and stainless steel reflect microwaves, while certain compositions of cold-rolled steel will absorb microwave energy to some extent. However, for all practical purposes, it may be said that metal reflects microwave energy.\nThe characteristics of microwaves make it possible to contain them within a specially constructed metal enclosure called a cavity . The microwaves bounce around this  oven cavity until they are either absorbed by food or dissipate into the air. The interior metal walls of a microwave oven cooking cavity are proportioned with the energy output from the magnetron tube. In other words, the physical proportions of the cavity are tuned to the frequency of the energy, thus producing a uniform electromagnetic wave pattern. (The sealing properties of the door, which essentially appear as a metal wall to the microwaves, and the resonant characteristics of the oven cavity, will be considered in more depth in future additions). Therefore, under normal circumstances the energy reflects from wall to wall like beams of light in a mirrored room. However, if something were to disrupt that energy pattern, it would produce undesirable results, such as arcing.\nLike a Small Bolt of Lightning\nWhen metallic objects are indiscriminately placed in a microwave oven cooking cavity, the energy pattern becomes disrupted and distorted. This condition produces arcing. When two metal objects, such as a metal bowl and the [metal] cavity wall, are placed in close proximity and subjected to an intense field of microwave energy, arcing will result. Arcing in a microwave oven is like a small bolt of lightning Arcing occurs because the air between the two metallic objects becomes electrically charged, just as the air between a thundercloud and the earth becomes charged or ionized. This ionized air becomes an electrical conductor, and electric current then leaps the gap like a small bolt of lightning.
903422
You can convert energy to microwaves, that can travel across space, to a receiver, that converts it back to electrical current.
758600
Your first paragraph is quite true. Tesla patented various methods for transmitting power using large resonators with local "receivers."  If you have a resonant cavity you can get pretty good coupling between source and receiver (microwave oven for example).  The general use for power distribution has its problems, not least of which is how do you charge($) the receiver?\n\nThe analogy of sympathetic vibration is valid.\n\nNot sure what to make of the magnetism bit.\n\nElectrons resonate - they may in fact be "resonances"\n\nOur entire electrical power system is based on Electricity and Magnetism so I think the answer is yes we can pick up energy.\n\nWhat may be missing is that we also have to provide the energy up front before we get to pick it up!
183506
A microwave is a device that creates HIGH POWER microwave RADIATION. If this stuff gets to you, then there is a possibility of cancer.  Remember the deal with cellphones and cancer?\n\n    Inside the microwave you'll notice there is a steal mesh.  You see it in front of your microwave(It's got millions of holes in it).  This mesh is called a Faraday cage. What this mesh does is that it is actually protects you, by "blocking" the microwaves from escaping.  Remove the mesh and the microwaves have a chance to escape into the environment.\n\n    Cellphones also create microwaves.  But the microwaves coming from your cellphone, pale in power compared to the microwaves coming from the oven.  \n\n    Remember that radiation get's embedded into your skin.  It stays there for a long time, and eats away at you slowly.
1023911
Electromagneticradiation
938575
Depends what you mean by electronic device. Only some circuits give of electromagnetic radiation - e.g. cell phones, unshielded power supplies.\n\nThe sorts of electromagnetic radiation given off by consumer electronics is safe. The only exception is cell phones. The latest advice is to avoid using a cell phone regularly for excessive periods without a headset - especially children.\n\nNo devices give off nuclear radiation (except smoke detectors)
958774
the microwave literally shoots microwaves at the food; these microwaves then vibrate the food particles, causing friction, which heats them up.\n\nhttp://www.gallawa.com/microtech/how_work.html how a microwave works, technically
756976
The magnetron generates electromagnetic waves. The food particals- absorb the energy and start viberating faster. So food heats up, and gets cooked. Glass and ceramic does not absorbe the energy to the same extent so remains relatively cool.
60247
Health problems usually associated with electromagnetic radiation (such as cancer) are caused by waves of much higher frequency.  In fact, the light from an ordinary 100-watt light bulb or the heats from a campfire (the heat only not including the smoke) have greater potential to cause cancer.  The only health problem that a microwave could cause is burns, but unless you really do break the glass on your microwave, you should be fine, just be careful about burning yourself on hot dishes and plates.