Graphical view of Planck's law for a black body (an ideal absorber and emitter). Planck's law states that any body that has a temperature above absolute zero emits electromagnetic radiation at all wavelengths. We can use Planck's law to predict the temperature of a remote body without actually being there, but seeing how much radiance is emitted by it on the spectrum we're scanning on. That's friggin awesome!
"Fluctuational electrodynamics" describes how tiny objects radiate
Planck's law - Wikipedia
Today in #history-4-#February-1974#SatyendraNathBose a noted #mathematician #professor and #physicist passed away at #Calcutta. He contributed greatly to #statictical #mechanics the #electromagnetic properties of #ionosphere the #therories of #Xray #crystallography and thermoluminescence and unified field theory. Bose instituted "Planck's Law and the #Hypothesis of Light Quana" in 1924.he was an IndianphysicistfromBengalspecialising intheoretical #physics. He is best known for his work…
Objects that are smaller than the wavelength of thermal radiation cannot radiate heat efficiently. A generalized theory of thermal radiation has now been experimentally confirmed at the level of a single object at the Vienna .
Sun and Earth's emission spectrum: Sun's is 3000/6000 = 0.5 micrometer wavelength (using Wien's Law); Earth's is 3000/288 = 10.41 micrometer wavelength; Sun and Earth are approximately black body radiators (snow is in the infrared); energy emission rate is given by: Stefan-Boltzman law (total emission), Wien's Law (peak emission wavelength), Planck's law (wavelength dependent emission)
Classical physics (Rayleigh–Jeans law, black line) failed to explain black body radiation – the so-called ultraviolet catastrophe. The quantum description (Planck's law, colored lines) is said to be modern physics.
Black body radiation and the ultraviolet catastrophe essaytyper UV Catastrophe (Black-Body Radiation, including the visible spectrum and finally the UV, thus eliminating the UV catastrophe. Planck's law of black-body.