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# Blackbody wavelength from Temperature

The **Wavelength of a Black body** calculator compute the wavelength of the strongest emissions from a black body based on its temperature.

**INSTRUCTIONS**: Choose units and enter the following:

- (
**T**) This is the temperature of the black body

**Wavelength (λ)**: The calculator returns the wavelength (**λ**) in nanometers. However, this can be automatically converted to other length units (e.g. angstroms) via the pull-down menu.

#### General Information

A black body at a fixed temperature emits most strongly at a particular wavelength that depends only on the temperature. This formula describes that relationship. Formally, Wien's displacement law states that the spectral radiance of black body radiation per unit wavelength, peaks at the wavelength λ_{max}. Therefore the formula for the temperature of a black body is::

` T = b /( λ_max) `

where

- T is the black body absolute temperature in kelvins.
- λ
_{max}is the maximum wavelength of the black body - b is a constant of proportionality called Wien's Dipsplacement constant , equal to 2.8977729(17)×10−3 m⋅K[1], or more conveniently to obtain wavelength in micrometers, b ≈ 2900 μm·K.

#### Related Astronomy Calculators:

- Compute the predominant wavelength (
**λ**) of a black body based on the temperature (**T**). - Compute the black body temperature (T) from the wavelength (λ)
- Compute wavelength from RF frequency.
- Compute the relative velocity (V) based on the wavelength (
**λ**) and shift in wavelength (**Δλ**). - Compute the wavelength shift (
**Δλ**) from the velocity and nominal wavelength of light (**λ**).

**Blackbody wavelength from Temperature**, is used in 2 calculators.

**Calculators**