Planck's law In 1880, André-Prosper-Paul Crova published a diagram of the three-dimensional appearance of the graph of the strength of thermal radiation as a function of wavelength and temperature. He determined the spectral variable by use of prisms. He 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. He put smooth curves through his experimental data points. They had one peak at a spectral value characteristic for the temperature, and fell either side of it towards the horizontal axis. Such spectral sections are
Nut graph Nut graph In journalism, a nut graph is a paragraph that explains the context of the story. The term is also spelled as nut graf, nut 'graph, nutgraph, nutgraf. It is a contraction of the expression nutshell paragraph. In most news stories, the essential facts of a story are included in the lede, the first sentence or two of the story. Good ledes try to answer who, what, when, where, why, and how as quickly as possible. The nut graf, which often will start in the third, fourth, or fifth paragraph, will explain any additional context for why the story