Today, 167 years ago, on April 23, 1858 (Calendar, March 10, 1858), German physicist Plunk was born. Plunk, April 23, 1858. German physicist. From his master's degree in physics at Humphrodite and Kirchhoff, only 21 years old, the following year was a lecturer at the University of Munich, a special professor at Kehl University in 1885. In his theoretical study of black body radiation and absorption in 1900, he first proposed an experimental formula applied to all bands of electromagnetic spectrum, i.e. the famous Planck radiation formula. At that time only in short and long wavelengths had a doctoral degree in physics, and in 1885 he successfully combined the Commercial Vine energy distribution formula and the Reilly radiation formula. In 1913, Danish phys