The Planck law does not suffer from an ultraviolet catastrophe, and agrees well with the experimental data, but its full significance ( which ultimately led to quantum theory ) was only appreciated several years later.
2.
Planck's first proposed solution to the problem in 1899 followed from what Planck called the " principle of elementary disorder ", which allowed him to derive Wien's law from a number of assumptions about the entropy of an ideal oscillator, creating what was referred-to as the Wien Planck law.
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