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Dr suman 1
Look at the given link carefully which shows the reduction of planks law to wein' law and the frequency value at which this transformation is done lying in microwave region. https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Quantum_Mechanics/02._Fundamental_Concepts_of_Quantum_Mechanics/Deriving_the_Wien's_Displacement_Law_from_Planck's_Law#:~:text=Wien's%20displacement%20law%20states%20that,inversely%20proportional%20to%20the%20temperature.&text=We%20need%20to%20evaluate%20the,to%20find%20the%20peak%20wavelength