## Black body radiation

Spectral radiance of a black body as defined by Planck's law:
$$I\left(\lambda, T\right) = \frac{2{\pi}hc^2}{\lambda^5}\frac{1}{\exp\left(\displaystyle\frac{hc}{{\lambda}kT}\right) - 1}$$
where (h) is the Planck constant, (c) is the speed of light, and
(k) is the Boltzmann constant.

**Explore the behaviour of the spectral radiance by manipulating
the black body temperature using the slider below!**

The wavelength of the irradiance maximum is labelled inside the plot.

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