31 Facts About Planck's law

In physics, Planck's law describes the spectral density of electromagnetic radiation emitted by a black body in thermal equilibrium at a given temperature, when there is no net flow of matter or energy between the body and its environment.

Planck's law can be encountered in several forms depending on the conventions and preferences of different scientific fields.

Planck's law describes the unique and characteristic spectral distribution for electromagnetic radiation in thermodynamic equilibrium, when there is no net flow of matter or energy.

Planck's law arises as a limit of the Bose–Einstein distribution, the energy distribution describing non-interactive bosons in thermodynamic equilibrium.

Kirchhoff's Planck's law of thermal radiation is a succinct and brief account of a complicated physical situation.

Related searches

Planck's law postulated an ideal black body that interfaced with its surrounds in just such a way as to absorb all the radiation that falls on it.

Four decades after Kirchhoff's insight of the general principles of its existence and character, Planck's law contribution was to determine the precise mathematical expression of that equilibrium distribution.

Planck's law was led by these two approximations to develop a law which incorporated both limits, which ultimately became Planck's law.

Planck's law was concerned with selective thermal radiation, which he investigated with plates of substances that radiated and absorbed selectively for different qualities of radiation rather than maximally for all qualities of radiation.

Planck's law discussed the experiments in terms of rays which could be reflected and refracted, and which obeyed the Helmholtz reciprocity principle.

Planck's law did not in this paper mention that the qualities of the rays might be described by their wavelengths, nor did he use spectrally resolving apparatus such as prisms or diffraction gratings.

Planck's law made his measurements in a room temperature environment, and quickly so as to catch his bodies in a condition near the thermal equilibrium in which they had been prepared by heating to equilibrium with boiling water.

Planck's law's measurements confirmed that substances that emit and absorb selectively respect the principle of selective equality of emission and absorption at thermal equilibrium.

Planck's law proposed that his measurements implied that radiation was both absorbed and emitted by particles of matter throughout depths of the media in which it propagated.

Planck's law applied the Helmholtz reciprocity principle to account for the material interface processes as distinct from the processes in the interior material.

Planck's law concluded that his experiments showed that, in the interior of an enclosure in thermal equilibrium, the radiant heat, reflected and emitted combined, leaving any part of the surface, regardless of its substance, was the same as would have left that same portion of the surface if it had been composed of lamp-black.

Planck's law did not mention the possibility of ideally perfectly reflective walls; in particular he noted that highly polished real physical metals absorb very slightly.

Planck's law's principle has endured: it was that for heat rays of the same wavelength, in equilibrium at a given temperature, the wavelength-specific ratio of emitting power to absorption ratio has one and the same common value for all bodies that emit and absorb at that wavelength.

In symbols, the Planck's law stated that the wavelength-specific ratio has one and the same value for all bodies, that is for all values of index.

Planck's law's proof intended to show that the ratio was independent of the nature of the non-ideal body, however partly transparent or partly reflective it was.

Planck's law's proof noted that the dimensionless wavelength-specific absorption ratio of a perfectly black body is by definition exactly 1.

Planck's law argued that the flows of heat radiation must be the same in each case.

Planck's law supposed that like other functions that do not depend on the properties of individual bodies, it would be a simple function.

Planck's law analyzed the surface through what he called "isothermal" curves, sections for a single temperature, with a spectral variable on the abscissa and a power variable on the ordinate.

Planck's law put smooth curves through his experimental data points.

Related searches

Gustav Kirchhoff was Max Planck's teacher and surmised that there was a universal law for blackbody radiation and this was called "Kirchhoff's challenge".

Therefore, he used the Boltzmann constant k and his new constant h to explain the blackbody radiation Planck's law which became widely known through his published paper.

Planck's law's thinking revolved around entropy rather than being directly about temperature.

Planck's law tentatively mentioned the possible connection of such oscillators with atoms.

Planck's law proposed in some detail that absorption of light by his virtual material resonators might be continuous, occurring at a constant rate in equilibrium, as distinct from quantal absorption.

Heisenberg's explanation of the Planck oscillators, as non-linear effects apparent as Fourier modes of transient processes of emission or absorption of radiation, showed why Planck's law oscillators, viewed as enduring physical objects such as might be envisaged by classical physics, did not give an adequate explanation of the phenomena.