generate questions: Classical statistical mechanics requires the existence of h (but does not define its value). Eventually, following upon Planck's discovery, it was recognized that physical action cannot take on an arbitrary value. Instead, it must be some multiple of a very small quantity, the "quantum of action", now called the Planck constant. Classical physics cannot explain this fact. In many cases, such as for monochromatic light or for atoms, this quantum of action also implies that only certain energy levels are allowed, and values in between are forbidden.
What does classical statistics mechanics not define the value of? {sep_token} What is required to exist in classical statistics mechanics? {sep_token} After Planck's findings, what was determined could not take on an arbitrary value? {sep_token} What is the "quantum of action" called? {sep_token} What does the Planck Constant refer to? {sep_token} Classical statistical mechanics requires the existence of what? {sep_token} What was realized after Planck's discovery? {sep_token} What is the Planck constant formerly known as? {sep_token} Regarding atoms, what does the Planck constant imply? {sep_token} Regarding atoms, what are values in between certain energy levels considered by the Planck constant? {sep_token} Following Planck's discovery, what was realized about values of physical action? {sep_token} The Planck constant initially was given what name? {sep_token} How is the proportional nature of the Planck constant explained? {sep_token} For certain cases of light or atoms, what does the quantum of action yield? {sep_token}