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The Rayleigh–Jeans law , another approach to the problem , agreed with experimental results at low frequencies , but created what was later known as the " ultraviolet catastrophe " at high frequencies .
 Rayleigh–Jeans
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Rayleigh–Jeans