We would apply Wien's displacement law which is expressed as
λmaxT = 0.002898mK
where
T is the temperature
From the information given,
λmax = 736.07 nm = 736.07 x 10^-9
T = 0.002898mK/736.07 x 10^-9
T = 3937
The approxinate temperature is 3937 K
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