property>second radiation constant

What is the Second Radiation Constant?

The second radiation constant, c₂, is used in Planck's law. It has the SI units of metres kelvin. It is given by the equation:

c₂ = hc / k

where h is the Planck constant, c is the speed of light and k is the Boltzmann constant. Its value is 1.438775x10^-2 m K.

Planck's law gives the radiation intensity emitted by a black body for a given frequency and temperature. It has the form:

u = c₁.λ^-5 / (ε^c₂/λT - 1)