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You use Wien's law when you need to find temperature given a maximum wavelength of radiation or when you need to find a maximum wavelength when given the temperature. If they mention max wavelength of anything and want you to find the temperature that's when you use Wien's law, and I don't think you'd use it to find temperature if they didn't mention specifically the maximum wavelength.
I believe Wien's law is used to determine either the temperature or wavelength based on which variables are provided in the problem. However, I don't think we would need to know Wien's law as of now because on Outline 2 Dr. Lavelle did not put 1B.11 as an option which was the question about Wien's Law.
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