13. Thermal radiation - Wien’s law, Stefan-Boltzmann law, plots with explanations. (4p Flashcards
1
Q
Thermal radiation
A
Thermal radiation is radiation given off by a body because of its temperature.
2
Q
Wien’s law
A
It is a relationship between the temperature of a blackbody (an ideal substance that emits and absorbs all frequencies of light) and the wavelength at which it emits the most light. When the temperature of a blackbody radiator increases, the overall radiated energy increases and the peak of the radiation curve moves to shorter wavelengths.
𝜆 = 2898 µm*𝐾 /𝑇
(tu wystarczy napisać, że constant zamiast tego na górze, ale zostawiłam tak na wszelki wypadek)
3
Q
Stefan-Boltzmann law
A
The Stefan–Boltzmann law describes the power radiated from a black body in terms of its temperature.
𝐼(𝑇) = 𝜎𝑇^4
where 𝜎 is called the Stefan-Boltzmann constant.
