Planck's law - Wikipedia

Black Body As the temperature of a black body decreases, its intensity also decreases and its peak moves to longer wavelengths. Shown for comparison is the classical Rayleigh–Jeans law and its ultraviolet catastrophe.

Planck's law violated at the nanoscale

"Fluctuational electrodynamics" describes how tiny objects radiate

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!

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!

Heat radiation of smallest objects: Theories beyond Planck's law describe this emission very accurately.

Heat radiation of smallest objects: Theories beyond Planck's law describe this emission very accurately.

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 .

October 19, 1900 – Max Planck, in his house at Grunewald, on the outskirts of Berlin, discovers the law of black-body radiation (Planck's law).

October 1900 – Max Planck, in his house at Grunewald, on the outskirts of Berlin, discovers the law of black-body radiation (Planck's law).

Wikipedia.org/ Max Karl Ernst Ludwig Planck-- 1858-1947 was a German theoretical physicist whose work on quantum theory won him the Nobel Prize in Physics in 1918.

Max Planck__Max Karl Ernst Ludwig Planck, (April 1858 – October was a German theoretical physicist who originated quantum theory, which won him the Nobel Prize in Physics in

October 19, 1900 – Max Planck discovers the law of black-body radiation (Planck's law)

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“October 1900 – Max Planck discovers the law of black-body radiation (Planck's law).

Predictions of the amount of thermal radiation of different frequencies emitted by a body. Correct values predicted by Planck's law (green) contrasted against the classical values (Rayleigh–Jeans law, red and Wien approximation, blue).

Introduction to quantum mechanics

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.

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.

Physics for Idiots_Thermodynamics

Physics for Idiots_Thermodynamics

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)

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)

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Solar spectrum: black body radiation and plancks law

What the spectrum from sun looks like in the space. Black body radiation and planck's law

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