Sentences with phrase «radiation emitted at»

The rate of electromagnetic radiation emitted at a given frequency is proportional to the amount of absorption that it would experience by the source.

But, just as the absorption from the surface is saturated, so is the radiation emitted at the top of the atmosphere.

(Note, by the way, that what is true for a radiating object is that the amount of radiation emitted AT ANY PARTICULAR WAVELENGTH is an increasing function of the temperature, a fact that is not always obvious because people often tend to normalize the emission curves when showing emission curves for different temperatures on the same graph.)

Within the X-ray glow, Reeves and his colleagues discerned radiation emitted at energy levels associated with several specific elements, including magnesium, silicon, sulfur, argon, and calcium — a mix of ingredients similar to that cast out from a supernova explosion.

Not exact matches

«The older an organism's remains are, the less beta radiation it emits because its C - 14 is steadily dwindling at a predictable rate.»

«I think most physicists would agree that Hawking's greatest contribution is the prediction that black holes emit radiation,» says Sean Carroll, a theoretical physicist at the California Institute of Technology.

At a conference, another astronomer asked him if the center could archive a terabyte of data that had been collected from the MACHO sky survey, a project designed to study mysterious cosmic bodies that emit very little light or other radiation.

Upon Hawking's death on March 14 at age 76, his most famous discovery — that black holes aren't entirely black, but emit faint radiation — was still fueling debate.

In 1903 French scientist René Blondlot added to the frenzy with his announcement of N - rays, a strangely democratic form of radiation emitted by wood, iron, living organisms — just about anything at all.

Dead stars known as pulsars (one illustrated above) emit beams of radiation that sweep past Earth at regular intervals.

The parallel sheets of incoming and outgoing current force the electrons to emit coherent, laserlike radiation at radio wavelengths as they spiral along the planet's magnetic field lines, Ergun says.

«And if you did, wouldn't that mean my phone isn't emitting radiation at all?»

Some black holes do this conspicuously, releasing outbursts of gamma rays and X-rays every time they feed, while others are «closet eaters» that emit very little radiation at feeding time.

The actual data did not look like much, mostly line graphs showing the intensity of radiation emitted by the stars at various wavelengths, but the meaning hidden behind those numbers had us talking all at once, lost in the fever of discovery.

Early in their lives, the radiation they emitted was largely blocked by the thick veil of their host nebula, visible only to telescopes at infrared and radio wavelengths.

Physicists fired polarized laser pulses at a block of glass, creating distortions that emitted Hawking radiation out the sides of the block (inset).

They then took a closer look at the spectrum of radiation emitted by each of these objects, using optical telescopes in Arizona and the world's largest radio telescope, the 305 - metre dish at Arecibo in Puerto Rico.

At the same time the surface and the atmosphere emit infrared radiation back to space, which produces cooling.

At that time, the Universe became transparent to radiation, and light - emitting objects became visible.

The telescope — based at the US National Radio Astronomy Observatory (NRAO) in West Virginia — was tuned to a frequency of 1420 megahertz, the wavelength of radiation naturally emitted by hydrogen in space.

Known as pulsars, the dead stars emit beams of radiation that sweep past Earth at regular intervals, like the rotating beams from a lighthouse.

The Unruh effect is closely related to Hawking radiation, extremely faint radiation emitted by a black hole at a temperature determined by its mass.

In computer simulations, the researchers show that a black hole can rapidly grow at the center of its host galaxy if a nearby galaxy emits enough radiation to switch off its capacity to form stars.

In 2009, the Spitzer Space Telescope discovered infrared radiation from a ring far beyond all the others encircling Saturn; sunlight heats the ring's dust, which emits its heat at infrared wavelengths.

Researchers looked at seven of these worlds — distant planets whose mass lies between one and 10 times ours — including 55 Cancri e (at right, compared to Earth) and GJ1214b, evaluating how the x-ray and extreme ultraviolet radiation emitted by their parent stars might affect their atmospheres over their remaining lifetimes.

The discovery could potentially provide a way to test Stephen Hawking's prediction that a real black hole should slowly evaporate as it emits radiation generated in the quantum turmoil at its event horizon.

They then looked at another source of data: that of the Clouds» and Earth's Radiant Energy System (CERES) satellite instruments which measure fluxes of reflected and emitted radiation from Earth to space, to help scientists understand how the climate varies over time.

So we said, «Why not look at the radiation [electrons] emit directly?»»

As some of this matter falls toward the black hole, it heats up and emits synchrotron radiation, which is characteristic of electrons whirling at nearly the speed of light around a magnetic field.

They found that HD 98800, which is an orange star, emits 10 per cent of its radiation in the far - infrared — at wavelengths between 10 and 100 micrometres.

In fact, a typical coal - fired power plant exposes local residents to as many as 18 millirems of radiation yearly, whereas a nuclear power plant emits less than six millirems per annum, according to researchers at Oak Ridge National Laboratory.

While observing at the frequency that hydrogen atoms emit radiation, it will be able to image a circle on the sky as wide as about five Full Moons.

Until now, XFELs have normally emitted one radiation pulse at a single wavelength like conventional visible lasers.

The electrons in strontium atoms emit radiation at 429,500 giga - hertz.

In the new study, Charles Hailey, an astrophysicist at Columbia University, and his colleagues scrutinized the past dozen years of data gathered by the Chandra X-ray Observatory, an orbiting craft whose instruments are designed to detect high - energy radiation emitted by the immensely hot material surrounding exploded stars and near black holes.

Clouds of dust and gas in the famIliar constellation emit radiation at infrared and radio wa velengths.

Neutral hydrogen emits radiation at a frequency of 1,420 MHz, but thanks to the ongoing expansion of the Universe and the Doppler Effect, that radiation shifts to a lower frequency.

When gas falls toward the black hole at the center of the galaxy NGC 4151, the gas heats up and emits ultraviolet radiation, which in turn heats the ring - shaped dust cloud orbiting the black hole at a distance.

X-ray source, in astronomy, any of a class of cosmic objects that emit radiation at X-ray wavelength.

Radio telescopes can detect neutral hydrogen because it emits radiation at a wavelength of 21 cm.

Many such objects contain detectable amounts of molecules that emit radio radiation at wavelengths that allow them to be identified and analyzed.

That the nebula is so much brighter than the star shows that the star emits primarily highly energetic radiation of the non-visible part of the electro - magnetic spectrum, which is absorbed by exciting the nebula's gas, and re-emitted by the nebula, at last to a good part in the visible light.

What is unique is that at the dawn of radio astronomy, a scientist predicted hydrogen would emit this radiation at detectable radio wavelengths, and this prediction offered astronomers a new tool for studying the universe.

Numerous molecules emit radiation at these wavelengths and thus can be detected by the 12 - Meter telescope.

It has been suggested by some vitamin D researchers, for example, that approximately 5 — 30 minutes of sun exposure between 10 AM and 3 PM at least twice a week to the face, arms, legs, or back without sunscreen usually lead to sufficient vitamin D synthesis and that the moderate use of commercial tanning beds that emit 2 % — 6 % UVB radiation is also effective [6,20].

Most infrared saunas emit electromagnetic radiation at base levels.

Further, electromagnetic radiation (such as that emitted by Wi - Fi, cell phones, cell towers and «smart» meters) may affect the body like light does at night — and inhibit melatonin production.

For me, the radiation emitted by these devices was so intense (even at lower brightness settings) that my eyes watered and burned to the point where I was forced to quit.

Radiative transfer in the earth's atmosphere is not particularly amenable to simple formulas because the atmosphere is semi-transparent to differing degree at different wavelengths, which allows radiation emitted locally to interact with the entire atmosphere.

Absorption of thermal radiation cools the thermal spectra of the earth as seen from space, radiation emitted by de-excitation is what results in the further warming of the surface, and the surface continues to warm until the rate at which energy is radiated from the earth's climate system (given the increased opacity of the atmosphere to longwave radiation) is equal to the rate at which energy enters it.