Astronomy & space · Grades 9–12
Blackbody peak wavelength · formula reference
This is the peak of spectral radiance per wavelength; a frequency-spectrum peak is a different definition.
Formula
This is the peak of spectral radiance per wavelength; a frequency-spectrum peak is a different definition.
λmax T = 2.898 × 10⁶ nm K
Worked example
A model blackbody has temperature 12900 K. Use Wien constant 2.898×10⁶ nm K to find its wavelength-spectrum peak. Round the final result to 4 decimal places if needed. Answer in nm.
Divide 2.898×10⁶ nm K by 12900 K.
224.6512 nm
Prerequisites and checking
Algebra and the topic definitions. Keep units and rounding consistent. State the model conditions before applying the formula.
Further reading and review references
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