Astronomy & space · Grades 9–12
Blackbody peak wavelength
This is the peak of spectral radiance per wavelength; a frequency-spectrum peak is a different definition.
Method and conditions
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 examples
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
A model blackbody has temperature 12200 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 12200 K.
237.541 nm
Try it
A model blackbody has temperature 14200 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.
A model blackbody has temperature 7800 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.
Check your work
Answers and marking notes
- 204.0845 nm
Divide 2.898×10⁶ nm K by 14200 K.
- 371.5385 nm
Divide 2.898×10⁶ nm K by 7800 K.
Further reading and review references
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