Planck


 * Planck's Constant**

In 1900, Max Planck worked on the problem of how the radiation an object emits is related to its temperature. He came up with a formula that usually agreed with the experimental data, but realized that it only worked if the energy was quantized. This meant that the energy of the molecule could only be certain values. The value of h was 6.626 x 10^-34 J • s; this is now known as Planck's Constant.



Planck's constant is a physical constant that allows us to calculate the sizes of quanta; the energy emitted by molecules. Even though Planck was the man who first discussed the theory of emission spectrum of black bodies, it was not until 1926 when quantum mechanics was understood correctly. The work of Werner Heisenberg and Erwin Schrödinger helped make mathematical sense ouf Planck's theory. Together, the work of Planck, Heisenberg and Schrödinger came up with Planck's constant, a formula that improved the scientifical world in many ways.

websites:

http://www.colorado.edu/physics/2000/quantumzone/photoelectric2.html en.wikipedia.org/wiki/Planck's_constant plancksconstant.org/