Sentences with phrase «radiation emitted when»

• In a caesium atomic clock, 9 billion cycles per second (9 gigahertz) is the frequency of radiation emitted when...

The tick of an atomic clock is measured by the frequency of radiation emitted when electrons around an atom change energy states.

Instead of relying on light waves emitted by electrons, it would use radiation emitted when the nucleus is excited to a high energy state, and then drops into a lower energy state.

Not exact matches

Wu was the first to verify — and later refine — Enrico Fermi's theory of radioactive beta - decay, which describes how some unstable atoms emit radiation when transforming into more stable atoms.

It all began in the mid-1970s, when Stephen Hawking of the University of Cambridge showed theoretically that black holes are not truly black, but emit radiation.

When the public began to question the safety of nuclear testing and of radiation emitted from televisions, the government took notice.

After the sun heats one side, the surface cools when it rotates into shadow and emits infrared radiation.

When a transmitter drives an oscillating current in an antenna electromagnetic radiation — which carries both power and signals away from the source — is emitted.

When the researchers placed the lattice in a vacuum heated to 1,250 degrees Celsius, they found that it converted radiation with an efficiency of 34 percent and emitted about 14 watts per square centimeter.

When these gamma rays reach the Earth's atmosphere they are absorbed, producing a short - lived shower of secondary particles that emit weak flashes of bluish light known as Cherenkov radiation, lasting just a few billionths of a second.

When the carbon molecule was hot, it emitted radiation that interacted with nearby walls, giving it a definite location.

The UV LED device also emits a much narrower band of UVB light and thereby decreasing likelihood of skin damage that can occur when the skin is exposed to higher wavelengths of UV radiation.

When an electron goes from the higher energy level to the lower it emits radiation of a precise frequency.

Trouble began brewing in the 1970s when Hawking mixed quantum mechanics into relativistic black hole theory and concluded that they should emit a tiny amount of radiation, which steals mass until the black hole evaporates.

In fluorescence microscopy, certain specimens, such as TB bacteria, can be dyed so that they emit light when exposed to ultraviolet radiation.

When ionized hydrogen in the nebula recombines it would emit Lyman - alpha radiation.

To limit inherent systematic uncertainties, Ghez's group accounted for overlapping light sources when one star passes in front of another or near the black hole itself, where infalling material emits radiation.

The positron moves so fast that it emits light called Cherenkov radiation, the optical equivalent of a sonic boom produced when a charged particle moves faster than the speed of light through some substance.

But these clocks are constrained in how precisely they can divide time because when caesium electrons jump from a certain state to another they emit radiation with a frequency of only 9 giga - hertz, or 9 billion cycles per second.

His idea was to use the High - Altitude Water Cherenkov observatory — made up of 300 water tanks on a Mexican mountaintop — to detect gamma radiation produced when charged particles emitted by pulsars interact with the gas between stars.

These molecules emit characteristic submillimetre radiation patterns when they rotate.

Life could eventually spread farther when such stars evolve pass their flare stage, since spectral - type M stars emit much less ultraviolet radiation once they quiet down.

When the star's ultraviolet radiation strikes the gases in the nebula, they heat up, giving out radiation ranging in wavelength from blue — emitted by hot oxygen in the bubble near the star — to yellow — emitted by hot hydrogen and nitrogen.

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.

They emit a narrow beam of intense radiation during a supernova when a massive star collapses into a neutron star or a black hole.

While optical instruments can detect the dust when it obscures more distant objects or when it is illuminated by very nearby stars, infrared telescopes are able to register the long - wavelength radiation that the cool dust clouds themselves emit.

However, even when many dark celestial bodies emit radiation, the emission may be observed just as «cosmic background» radiation if the sensitivity and resolution of the telescope in use is insufficient.

Surface radiative energy budget plays an important role in the Arctic, which is covered by snow and ice: when the balance is positive, more solar radiation from the Sun and the Earth's atmosphere arrives on the Earth's surface than is emitted from it.

Cosmic background radiation — that amazing «first light» emitted when the Universe was only a few hundred thousand years old — exists mainly in the form of microwaves.

According to a study published in the Journal of Investigative Dermatology harmful radiation emitted by TV screens, computer screens, and even uncovered fluorescent lights may cause dark spots on skin when you expose your skin to this radiation regularly for a longer periods of time.

Cell Phones and Electromagnetic Radiation Your cell phone emits electromagnetic radiation that enters the brain when you hold it to your ear.

When atoms decay, they emit three types of radiation, alpha, beta and gamma.

What other things in the Earth system will change when it warms up that will affect how much SW radiation is reflected back into space [eg ice - albedo feedback, cloud changes] or affect what proportion of emitted LW radiation is allowed to escape to space [eg Water Vapour, cloud changes].

Both can and will emit IR radiation when in in excited state, going down in temperature in the process.

The effect where, adding a «new» absorption band and increasing the absorption, there may initially be warming of the colder layers, etc, followed by a stage of upper level or near - TOA cooling — this includes the warming from absorption from increased radiation from the surface + troposphere — which will be greater when more of the spectrum, especially near wavelengths where the emitted spectral flux change is greatest, has a greater amount of absorption.

Re 9 wili — I know of a paper suggesting, as I recall, that enhanced «backradiation» (downward radiation reaching the surface emitted by the air / clouds) contributed more to Arctic amplification specifically in the cold part of the year (just to be clear, backradiation should generally increase with any warming (aside from greenhouse feedbacks) and more so with a warming due to an increase in the greenhouse effect (including feedbacks like water vapor and, if positive, clouds, though regional changes in water vapor and clouds can go against the global trend); otherwise it was always my understanding that the albedo feedback was key (while sea ice decreases so far have been more a summer phenomenon (when it would be warmer to begin with), the heat capacity of the sea prevents much temperature response, but there is a greater build up of heat from the albedo feedback, and this is released in the cold part of the year when ice forms later or would have formed or would have been thicker; the seasonal effect of reduced winter snow cover decreasing at those latitudes which still recieve sunlight in the winter would not be so delayed).

When the Earth's surface emits far infrared radiation (or any other wavelength), does the temperature not fall?

When there are no greenhouse gases the atmosphere can not absorb incoming radiation or emit outgoing radiation.

July 17, 2013 at 1:39 pm The lapse rate feedback is only a negative feedback (in the general circulation model) if the long wave radiation that is released when the water vapour condenses is emitted to space rather than trapped by increased water vapour.

How can the earth be radiating a crude BB type spectrum corresponding to the surface Temperature when Trenberth claims that only 40 W / m ^ 2 escapes to space in the atmospheric window, and folks insist that the main body of the atmosphere (gases) does not emit thermal radiation.

2) I've read that atmospheric CO2 acts like a dam: when it warms up, it emits more and more infrared radiation in all directions, one of those directions being back down to Earth.

Do you think that the molecules in the atmosphere, when they emit radiation, only emit in the direction where the destination (so to speak) is cooler than they are?

Tomcat, Behind the bluelight emitted by burning natural gas, LPG, acetylene is the huge heat (when C+O 2 released chemical heat) or thermal heat (thermal radiation) or Myrrh's invisible or dark light.

When this occurs, the difference between the infrared reflectance and the visible red reflectance, used in calculating NDVI, is smaller than it would be if the emitted radiation were intercepting vegetation.

Tom Vonk is correct when he says that the following statements are over-simplifications and need corrections (in caps): «CO2 absorbs AND EMITS the outgoing infrared energy and warms the atmosphere TO A HIGHER TEMPERATURE THAN IT WOULD HAVE WITHOUT CO2» — or — «CO2 traps part of the infrared radiation between ground and the upper part of the atmosphere» AND IS THE MAJOR SOURCE OF INFRARED RADIATION FROM THE UPPER ATMOSPHERE radiation between ground and the upper part of the atmosphere» AND IS THE MAJOR SOURCE OF INFRARED RADIATION FROM THE UPPER ATMOSPHERE RADIATION FROM THE UPPER ATMOSPHERE TO SPACE.

When you add GHGs to the atmosphere, it both emits more radiation towards space and earth and absorbs more radiation mostly from earth.

But when an object is small compared to the wavelength, then radiation can be emitted from any point within its volume.

Where I see a lot of confusion, is when people talk about the atmosphere, with its GHGs «reflectign surface emitted LWIR radiation back to the surface.

However, once equilibrium is as close as it can be then theoretically, re-radiation should occur at night, or at the point when the temperature goes down, and presumably this is where the greenhouse effect should be felt the most — yet matter emits heat very quickly — and quickly thermalise to new temperatures, so as not to give off that much radiation.

Sunspot Activity When the number of sunspots is high, the Sun emits higher amounts of solar radiation.