Ultraviolet catastrophe 
This article includes a

The ultraviolet catastrophe, also called the Rayleigh–Jeans catastrophe, was the prediction of late 19th century/early 20th century
The term "ultraviolet catastrophe" was first used in 1911 by
The ultraviolet catastrophe results from the
An example, from Mason's A History of the Sciences,^{
[2]} illustrates multimode vibration via a piece of string. As a
According to classical electromagnetism, the number of electromagnetic modes in a 3dimensional cavity, per unit frequency, is proportional to the square of the frequency. This therefore implies that the radiated power per unit frequency should follow the Rayleigh–Jeans law, and be proportional to frequency squared. Thus, both the power at a given frequency and the total radiated power is unlimited as higher and higher frequencies are considered: this is clearly unphysical as the total radiated power of a cavity is not observed to be infinite, a point that was made independently by