Wien's Displacement Law
Also known as peak wavelength of a hot body
Enter your known values, leave one input blank, and solves for the missing one. Try different units for next level excitement!
Constant used — built into this formula, no need to enter
Wien displacement law constant (wavelength) · exactLearning zone
Everything glows with a spectrum whose peak slides to shorter wavelengths as it heats: multiply peak wavelength by temperature and you always get b = 2.898 mm·K. The Sun's 5772 K surface peaks at 502 nm — green light, dead center of human vision, no coincidence of evolution. Your own 310 K body peaks at 9.3 μm, the mid-infrared band thermal cameras watch. Astronomers read a star's temperature straight off its color with this one division.
Wien's Displacement Law
Where
- = Peak wavelength
- = Absolute temperature
Missing one of these? Work it out first, then come back
- Peak wavelength — Photon Energy from Wavelength (E = hc/λ), Photon Momentum (p = h/λ)
- Absolute temperature — Gas Density from Molar Mass, Kp from Kc (Kp = Kc(RT)^Δn)