black-body radiation
81Crookes radiometer — The Crookes radiometer, also known as the light mill, consists of an airtight glass bulb, containing a partial vacuum. Inside are a set of vanes which are mounted on a spindle. The vanes rotate when exposed to light, with faster rotation for more …
82Photon gas — In physics, a photon gas is a gas like collection of photons, which has many of the same properties of a conventional gas like hydrogen or neon including pressure, temperature, and entropy. The most common example of a photon gas in equilibrium… …
83Annus Mirabilis papers — Einstein, in 1905, when he wrote the Annus Mirabilis papers The Annus Mirabilis papers (from Latin annus mīrābilis, extraordinary year ) are the papers of Albert Einstein published in the Annalen der Physik scientific journal in 1905. These four… …
84Timeline of cosmic microwave background astronomy — Timeline of cosmic microwave background astronomyThermal (non microwave background) temperature predictions* 1896 Charles Edouard Guillaume estimates the radiation of the stars to be 5.6K. [Guillaume, C. E., 1896, La Nature 24, series 2, p. 234,… …
85Hungary — This article is about the European country. For other uses, see Hungary (disambiguation). Republic of Hungary Magyar Köztársaság …
86Timeline of thermodynamics, statistical mechanics, and random processes — A timeline of events related to thermodynamics, statistical mechanics, and random processes. Ancient times *c. 3000 BC The ancients viewed heat as that related to fire. The ancient Egyptians viewed heat as related to origin mythologies. One… …
87Quantum — In physics, a quantum (plural: quanta) is an indivisible entity of a quantity that has the same units as the Planck constant and is related to both energy and momentum of elementary particles of matter (called fermions) and of photons and other… …
88Vacuum tube — This article is about the electronic device. For experiments in an evacuated pipe, see free fall. For the transport system, see pneumatic tube. Modern vacuum tubes, mostly miniature style In electronics, a vacuum tube, electron tube (in North… …
89Photoelectric effect — The photoelectric effect is a quantum electronic phenomenon in which electrons are emitted from matter after the absorption of energy from electromagnetic radiation such as x rays or visible light.cite book | title = Physics for Scientists… …
90Quantum mechanics — For a generally accessible and less technical introduction to the topic, see Introduction to quantum mechanics. Quantum mechanics …
