Black Body Peak Calculator
Calculate the peak emission wavelength of a black body using Wien's displacement law: lambda_max = b / T.
Lunghezza d'Onda di Picco
0.00000050 m
Peak Wavelength vs Temperature
Formula
## Wien's Displacement Law Wien's law states that the peak emission wavelength of a black body is inversely proportional to its temperature. ### Formula **lambda_max = b / T** where b = 2.8978 x 10^-3 m·K is Wien's displacement constant. Hotter objects peak at shorter wavelengths (bluer light).
Esempio Risolto
The Sun's surface temperature (~5778 K).
- 01lambda_max = b / T
- 02lambda_max = 2.8978e-3 / 5778
- 03lambda_max = 5.015e-7 m
- 04lambda_max = 501.5 nm (green-yellow visible light)
Domande Frequenti
Why does the Sun appear yellow-white if it peaks in green?
The Sun emits broadly across the visible spectrum. Our eyes and atmosphere combine to make it appear yellow-white rather than green.
What color are the hottest stars?
Blue. Very hot stars (>30,000 K) peak in the ultraviolet and appear blue-white. Cool stars (~3000 K) peak in infrared and appear red.
How is Wien's law used in astronomy?
By measuring the peak wavelength of a star's spectrum, astronomers can determine its surface temperature without visiting it.
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