what IS Cosmic Microwave background Radiation??
Questions by e-mailFor now, let me say that it's a very cool glow that permeates the Universe, and provides us with a glimpse of a very hot early epoch in cosmic history. We believe that the CMB spectrum does indeed contain deviations from a pure blackbody, because of the interactions of the hydrogen and helium. But they're at such a low level, and in the low energy tail of the spectrum, that it's incredibly hard to imagine how you might detect such a signal.
Related QuestionsWho discovered the Cosmic Microwave background?
Questions by e-mailThe Cosmic Microwave Background was discovered by Arno Penzias and Robert Wilson sometime in 1964 during studies they had been making using a sensitive microwave receiving system at Bell Labs. The results were published in 1965 and the pair received the Nobel Prize in Physics for their discovery in 1978. Given that all of space expands at the same rate...then spaces that are farther apart from one another expand away from each other faster than spaces that are closer together ..
Related QuestionsWhat is the significance of the Cosmic Microwave Background?
Questions by e-mailThe existence and spectral shape of the CMB provides very strong evidence for the "hot Big Bang" picture for an evolving Universe which used to be very much hotter and denser.
Related QuestionsHow are cancer patients affected by the cosmic radiation in space?
NASA's Web of LifeCurrently, no missions have flown with a cancer-bearing patient. However, scientists have conducted preliminary studies on the effects of exposure to radiation in space. Since high levels of radiation are known to cause higher-than-normal mutation rates (which can lead to cancer) within a living cell, the levels of cosmic radiation experienced outside of Earth's protective atmosphere will be a large concern in the coming era of longer manned spaceflights.
Related QuestionsWhat is cosmic radiation?
The Society for Radiological Protection - Services - Frequen...Cosmic radiation is composed of streams of particles coming partly from the sun and partly from outer space. This radiation interacts with the upper atmosphere to produce the cosmic radiation we experience at the earth's surface People who live at high altitude have a higher dose from cosmic radiation than those who live at sea level because shielding by the atmosphere is less. Aircrews and frequent flyers spend time at very high altitudes where the dose is even higher.
Related QuestionsHow does the vacuum energy density relate to the cosmic microwave background energy density?
Questions by e-mailInterms of the contribution to the critical energy denisty required to make the geometry of the Universe "flat", vacuum energy is believed to contribute about 2/3, while the CMB contributes about 0.005 of a percent. It's important to realise though, that in an expanding universe, the vacuum energy has only been dominant at relatively recent times. And that if you go back early enough the radiation dominates over regular matter too.
Related QuestionsWhat's "Cosmic" about it?
Cosmic Microwave Background - FAQsWe refer to it as "cosmic" because the only known source of this radiation is the early universe. It can now be firmly concluded that the CMB is the cooled remnant of the hot Big Bang itself. Light comes in a range of wavelengths, from the shortest wavelength gamma-rays to the longest wavelength radio waves, with common-or-garden visible light in the middle.
Related QuestionsWHAT IS "RADIOFREQUENCY" AND MICROWAVE RADIATION?
OET -- RF Safety FAQ'sElectromagnetic radiation consists of waves of electric and magnetic energy moving together (i.e., radiating) through space at the speed of light. Taken together, all forms of electromagnetic energy are referred to as the electromagnetic "spectrum." Radio waves and microwaves emitted by transmitting antennas are one form of electromagnetic energy. They are collectively referred to as "radiofrequency" or "RF" energy or radiation.
Related QuestionsWhat is background radiation?
Medical ImagingThe Earth consists of material that contains very low levels of radiaoctive isotopes and so we all receive varying amounts of this all through our lives. This has always been the case and is not dependent on any man-made activities such as nuclear power or weapons, although this can add to the background radiation in certain situations. In addition the earth receives a constant bombardment of cosmic rays and particles (sun and outer space).
Related QuestionsHow do we describe background radiation?
Low Dose Radiobiology - Frequently Asked QuestionsNatural background radiation is the radiation exposure or dose that is received daily from normal sources. Natural background radiation comes from cosmic radiation, internally deposited radioactive materials in the body, and radiation such as radon from environmental sources such as soil and granite. The average natural background radiation in the United States is about 300 mrems or 3.0 mSv per year with the radon exposure being responsible for about half of the total.
Related QuestionsWhat is a Cosmic Wimpout?
FAQ - Cosmic Wimpout - Frequently Asked Questions and Their ...A Cosmic Wimpout is an unusually fun roll that ends with a player wimping out and losing a lot of points. It usually happens after the player is forced to keep rolling by the Futtless Rule, Re-Roll Rule, or the You May Not Want To But You Must Rule. You will know when it happens by all the laughter and twisted expression on the face of the victim-player.
Related QuestionsWhat Is Radiation?
CDC Radiation Emergencies | Frequently Asked Questions (FAQs...Amounts of radiation released into the environment are measured in units called curies. However, the dose of radiation that a person receives is measured in units called rem. Radiation Emergency Assistance Center/Training Site of Oak Ridge Associated Universities: Radiation Accident Management
Related QuestionsWhy is the cosmic radiation that hits Canada more intense than that which hits Mexico?
Questions by e-mailThis is a question about Cosmic Rays (i.e. high energy particles hitting the Earth from space), rather than the Cosmic Microwave Background (i.e. low energy photons generated in the very early Universe). I may claim to be an expert on the latter topic, but not the former, sorry! Having, said that, there is clearly a latitude dependence in the amount of cosmic rays reaching the ground, because of the Earth's magnetic field (which in fact protects us from most of the cosmic rays).
Related QuestionsWhere does background radiation come from?
Questions by e-mailThe main points are: (1) the CMB appears to come from all directions and is therefore "cosmic"; (2) is it's hard to make a really good blackbody spectrum from the emission of some relatively local (e.g. cold dust in the intergalactic medium) material; (3) it's easy to make a blackbody in the early Universe, since the timescale for reaching thermal equilibrium was once very short.
Related QuestionsHow effectively is microwave radiation absorbed by rocks (silicates)?
Questions by e-mailAlthough I do know that it would be a poor experimental design for a CMB experiment to build it underground!
Related QuestionsDoes Microwave oven emit radiation that is harmful to health / causes cancer?
Godrej Smartcare - FAQs ::Microwave oven is a non-ionizing appliance, that does not change the physical and chemical properties of food, and it only heats the same. Microwaves when exposed to the food get completely absorbed that help in heating / cooking the food. The heat is generated by causing friction between the microwaves and the food molecules. The microwaves are completely converted into heat and there is nothing left behind, in the food.
Related QuestionsExplain why the cosmic microwave backround is considered good evidence for the big bang theory?
Questions by e-mailCosmic microwave background radiation is found everywhere, filling all space. It had been predicted in 1948 by George Gamow's collaborators as the cooled remnant of the hot fireball created in the Big Bang. The Universe therefore appears to be changing with time. This conclusion is supported by the observed evolution of galaxies and quasars as we look to distant and therefore younger reaches of the Universe.
Related QuestionsCAN I MICROWAVE MY PIZZA?
Totino's - Frequently Asked QuestionsNo. Pizzas are not designed to be microwaved. Because of the uneven heating in a microwave, you can never be certain of a thorough cook which can compromise the safety of the product.
Related QuestionsWhat the Heck is Cosmic Wimpout?
FAQ - Cosmic Wimpout - Frequently Asked Questions and Their ...If the first time you heard "Cosmic Wimpout," you said, "Cosmic What?" then you need to know that Cosmic Wimpout is a Dice Game that's Pure Fun. You play by rolling the five Cosmic Wimpout cubes and get points for each 5, 10, or Flash (triplet) that you roll. You can accumulate points towards the Winning Total by ending your turn or risking it all, because if you roll and don't score, you lose all the points for that turn and the next player goes.
Related QuestionsCan energy be derived from cosmic radiation, much like a photovoltaic cell does from visible light?
Questions by e-mailUnfortunately not. At one level this would be against the laws of thermodynamics, since is like a "thermal bath" filling the whole Universe with a temperature of about 2.73 Kelvin - so you'd need a "heat engine" colder than that to extract energy! In any case, from a practical point of view, the energy per unit volume in the CMB is minuscule by everyday standards - that's why it can pervade everything while having essentially no effects.
Related QuestionsQ-2: What is the difference between EMFs, RF, ELF and microwave radiation?
EMF & EMX Questions and AnswersEMF is a general designation covering all types of electromagnetic fields; however, EMF is commonly used as a name for non-ionising electromagnetic fields. RF means "radiofrequency"; this is a term used mainly for frequencies in the kilohertz (thousands of hertz, or cycles per second) and low megahertz (millions of hertz) region, sometimes also for microwaves in the high megahertz and gigahertz region.
Related QuestionsHow about the microwave?
FAQ for Botany 301Will you know if I used silica gel, the oven, or the microwave? How long do the plants need to stay in the press? Until they're dry. Okay, smarty pants, how long will that be? This depends on what you have (small things vs. big, juicy things), how much you have (a little vs. a very full press), and whether or not you're using the dryers in room 004. Generally, most plants will dry in those dryers in 5 to 7 days. Wet things take longer. Is there a way to make wet stuff dry more quickly? Yes.
Related QuestionsWhirlpool MagiCook microwave zoneMicro, means small or electro magnetic waves, and are a form of radiant energy. Microwaves are colorless, odorless and tasteless and cannot be seen by naked eye. Microwaves travel at the speed of light and have a frequency of 2450 MHz (for those used in microwave ovens). Microwaves vibrate with a frequency of 2450 MHz, i.e. 2450 million times per second. Microwaves have a special affinity towards water, sugar and fat.Related Questions
What is radiation and chemotherapy?
Frequently Asked Questions About Breast Cancer | Advocate He...Radiation and chemotherapy are two forms of treatment options used to treat various types of cancer, with or without surgical interventions. Radiation therapy is used for local control of the disease. It uses a directed and controlled beam of radiation to treat the tissue surrounding the surgical site to destroy and leftover cancer cells that may remain. Chemotherapy is used for distant disease control.
Related QuestionsWhat is radiation therapy?
Community Cancer Care: FAQRadiation is a special kind of energy carried by waves or a stream of particles. It can come from special machines or from radioactive substances. When radiation is used at high doses (many times those used for x-ray exams), it can treat cancer and other illnesses. Special equipment is used to aim the radiation at tumors or areas of the body where there is disease. The use of high-energy rays or particles to treat disease is called radiation therapy.
Related QuestionsWhat is Cosmic Cabaret?
The Physics Chanteuse FAQCosmic Cabaret are science cabaret-style variety shows produced and hosted by Lynda Williams as the Physics Chanteuse. The shows feature skits, songs, music, short movies, comedy acts and media on science and technology themes and are intended for a general audience. Cosmic Cabarets are held at different venues but currently are held at the SFSU Planetarium. Past venues include The El Rey Theater in LA and the Climate Theater in SF.
Related QuestionsRadiation Frequently Asked Questions - Bioterrorism on Yahoo...Radiation is a form of energy that is present all around us. Different types of radiation exist, some of which have more energy than others. Amounts of radiation released into the environment are measured in units called curies. However, the dose of radiation that a person receives is measured in units called rem.Related Questions
FAQ English — FoeBuD e.V.RFID technology uses radio waves, i.e. radiation. When this technology is introduced on a broad scale, the amount of radiation you will be subjected to will increase. According to type and reading range aimed for, one needs more or less powerful transmission of radio waves. There is not much known about the risks of this radiation -- like about that of mobile phones and their related transmission masts -- but some concerns have been raised.Related Questions
Learn about the side effects of cancer treatment, getting te...Visible light, infrared and ultraviolet light, and radio waves are other familiar forms of electromagnetic radiation. High energy X-rays are similar to diagnostic X-rays but the difference between the two is like comparing a fire hose to a squirt gun. Electrons are particles also produced by linear accelerators. Electrons only treat to a shallow depth, while high energy X rays can treat to a greater depth in the body.Related Questions
