The wavelength at which maximum power is emitted can be calculated according to the equation
λmax=3×106 / T
where the wavelength λmax is in nanometers (one billionth of a meter) and
the temperature T is in K (the constant 3×106 has units of nm×K).
This relationship is called Wien’s law.
For the Sun, the wavelength at which the maximum energy is emitted is 520 nanometers, which is near the middle of that portion of the electromagnetic spectrum called visible light.
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