Planck's Law Calculator
Calculate spectral radiance and peak wavelength using Planck's law and Wien's displacement law.
How to Use the Planck's Law Calculator
- Enter wavelength in micrometers (µm).
- Enter blackbody temperature in Kelvin.
- Click Calculate for spectral radiance and peak wavelength.
Cas d'utilisation
- •Astrophysics and stellar physics.
- •Infrared sensor design.
- •Thermal imaging calibration.
Formule
Formula: B(λ,T) = 2hc²/λ⁵ × 1/(e^(hc/λkT)−1). Peak wavelength (Wien): λ_max = 2897.8 µm·K / T.
Questions fréquemment posées
What is Planck's law?
Planck's law describes the spectral distribution of electromagnetic radiation emitted by a blackbody in thermal equilibrium at a given temperature.
What is Wien's displacement law?
Wien's law states the peak wavelength of blackbody radiation is inversely proportional to temperature: λ_max × T = 2897.8 µm·K.
What temperature does the sun radiate at?
The sun's surface temperature is about 5778 K, giving a peak wavelength of ~502 nm (green light), which is why sunlight peaks in the visible spectrum.