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
What Is the Matter with Willi? 1972. What Is the Matter with Willi? What Is the Matter with Willi? (German:Was ist denn bloß mit Willi los) is a 1970 German comedy film directed by Werner Jacobs and starring Heinz Erhardt, Ralf Wolter and Ruth Stephan. A tax inspector tries to reform the Ministry of Finance. It was based on a character Heinz Erhardt played on television. It was followed by a loose sequel "That Can't Shake Our Willi!" and in 1971 a third film "Our Willi Is the Best" was made with Erhard returning as Willi. The final film "Willi Manages The Whole Thing" was released