Blackbody Radiation
All objects with a temperature above absolute zero (0 K, -273.15 oC) emit energy in the form of electromagnetic radiation.
Blackbody:
Blackbody is a surface that absorbs all radiant energy falling on it. The term arises because incident visible light will be absorbed rather than reflected, and therefore the surface will appear black.
Blackbody sails tacking into the flux
Y'know, if you login, you can write something here. You can also Create a New User if you don't already have an account.
Password ...
Definition: blackbody radiation: Blackbody radiation is produced by an object which is a perfect absorber of heat. Perfect absorbers must also be perfect radiators.
Definition: blackbody temperature: The temperature of an object if it is re-radiating all the thermal energy that has been added to it; if an object is not a blackbody radiator, ...
blackbody curve The characteristic way in which the intensity of radiation emitted by a hot object depends on frequency. The frequency at which the emitted intensity is highest is an indication of the temperature of the radiating object.
blackbody radiation
The radiation -- the radiance at particular frequencies all across the spectrum -- produced by a blackbody -- that is, a perfect radiator (and absorber) of heat.
blackbody
An object which does not reflect any radiation, it is all absorbed.
black dwarf
A ball of gas which is not capable of nuclear fusion within its core, which is required to produce energy.
Blackbody - An object that is a perfect absorber of radiation falling on it ...
Blackbody Radiation
(a) Radiation whose spectral intensity distribution is that of a blackbody in accordance with Planck's law. (sometimes called thermal radiation) ...
Blackbody is a Shockwave applet that opens in your browser. By altering the temperature of the object you see the change in the shape and peak intensity of its Planck curve, the colour of the object and more.
Blackbody (perfect) emitter/absorber
Blackbody spectrum shape
Stars (dense gas) approximate blackbody spectra
Higher Temp, shorter (bluer) peak, ...
Blackbody radiation is light in thermal equilibrium, light radiation with a given temperature. It is the basic thermodynamic state of light.
Blackbody radiation is the result of
[A] particles interacting with a magnetic field
[B] particles annihilating with other particles
[C] particles interacting with photons so that thermalization occurs ...
blackbody - (n.)
Body capable of absorbing energy of all wavelengths falling on it; it is also capable of radiating all frequencies in a particular ratio to its absorbing properties. The value of the ratio depends only on the temperature of the body.
Blackbody radiation; radiation caused by the high temperature of the radiating objects, as opposed to nonthermal radiation, which is caused by energetic (not necessarily hot) electrons. [H76]
Thermalization ...
- Blackbody Radiation - the solution to the famous blackbody radiation experiment
- Surveyor - Lunar Missions
- "Freelancer" Space Sim Game - Game Info, Demo, Cheats, Movie ...
As a blackbody sits and emits radiation it is radiating away photons, and hence energy. In fact a blackbody is trying to come into temperature equilibrium with its surroundings. If it absorbs more photons of higher energy, then it heats up.
blackbody (NASA SP-7, 1965) (symbol b used as a subscript)
1. An ideal emitter which radiates energy at the maximum possible rate per unit area at each wavelength for any given temperature.
1859: Gustav Kirchhoff formulates the blackbody theorem E=J(T,n);
1873: Willoughby Smith discovers the photoconductivity of selenium;
1879: Stefan-Boltzmann law formulated empirically omega_T^4 ...
1934 - Richard Tolman shows that blackbody radiation in an expanding universe cools but remains thermal
1941 - Andrew McKellar uses the excitation of CN doublet lines to measure that the "effective temperature of space" is about 2.3 K ...
The grains cool by (approximately) black-body emission, modified by a wavelength-dependent emissivity cause largely by the fact that the grains are smaller than the blackbody peak wavelength and thus cannot radiate such wavelengths as efficiently as ...
Astronomers believe that this radiation was much hotter in the past and that it should behave like a "blackbody" (an object that is perfectly black because it absorbs all of the electromagnetic radiation that reaches it).
The average power radiated by Uranus is equivalent to that of a blackbody radiating at a temperature of 59.1 K. This radiation temperature is equal to the physical temperature of the atmospheric gases at a pressure of about 0.4 bar.
Sometimes astronomers use the term ``blackbody'' spectrum for a thermal spectrum. A ``blackbody'' is an object that absorbs all the light falling on it, reflecting none of it, hence, it appears black.
It has a perfect blackbody spectrum, meaning it behaves like radiation from an object that absorbs and emits all radiation that falls upon it. Its temperature is 2.7 degrees Kelvin (-454.81 degrees Farenheit).
(CIBR), the Differential Microwave Radiometer (DMR) to map the cosmic radiation sensitively, and the Far Infrared Absolute Spectrophotometer (FIRAS) to compare the spectrum of the cosmic microwave background radiation with a precise blackbody.
This effect, known as blackbody radiation, happens to all objects, regardless of it's temperature.
The other two instruments were the Far Infrared Absolute Spectrophotometer (FIRAS) which compared the cosmic background radiation to an accurate blackbody source and observed the dust and light emission from the Galaxy; ...
The spectrum matches with that emitted by a blackbody of temperature 3K. After making the appropriate correction, the radiation is homogeneous and isotropic to a very high precision.
Thermal emission: Radiation emitted due to an object's temperature (e.g., blackbody radiation) or by an ionized gas.
W
Top of page ...
EM radiation has an electric field and magnetic field component which oscillate in phase perpendicular to each other and to the direction of energy Wave propagation....
that corresponds to a thermal equilibrium blackbody spectrum of roughly 2.
black body, blackbody (symbol b used as a subscript) 1. An ideal emitter which radiates energy at the maximum possible rate per unit area at each wavelength for any given temperature.
 See also: Temperature, Energy, Light, Spectrum, Wavelength
|
