Relationship between wavelength and color temperature

Well, I think you may be asking about the relationship between the wavelength of light waves and the temperature of the corresponding radiator.

Actually, it has something to do with it. Experienced steel workers can judge the approximate temperature of molten steel by the color of light emitted by molten steel. In fact, there are also instruments to determine the temperature of objects by infrared scanning. When SARS broke out a few years ago and swine flu broke out in the first half of the year, the temperature was measured in places where people gathered, such as railway stations and airports. Have you ever seen the staff use thermometers to measure one by one? Most of them are infrared remote sensing instruments, right?

In fact, the wavelength λ of light wave corresponds to photon energy ε, ε=hc/λ, H = 6.626× 10 (-34) JS, which is Planck constant, and C is the speed of light in vacuum. ; Because photons have no rest mass, photon energy is actually kinetic energy, and kinetic energy is also a microscopic reflection of temperature. ε=KT/2 is roughly such a formula, and the degree of freedom n of photons has been forgotten ... Hehe, but you can look it up if you are interested. Where k is Boltzmann constant and t is thermodynamic temperature. .