in black body radiation why color changes from orange to white and then blue. does white has a specific wavelength, if yes then what is it, and if no then why white appears after orange. PLEASE EXPLAIN
(DULL RED--RED--ORANGE--YELLOW--WHITE--BLUE)
Answers
Answer:
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Explanation:
Introduction
The so called "blackbody radiation" is a very interesting phenomenon: every object radiates (and absorbs) electromagnetic waves. The spectrum of this radiation is not dependent on the chemical composition of the matter but it's only determined by its absolute temperature T. The term blackbody comes from a theoretical model of an object absorbing all incident radiation that is used to develop the quantum mechanic equations. It turns out that all objects behaves like blackbodies, regardless if they are actually black or not.
At ambient temperature the majority of the emitted spectrum is in the long wave infrared which is not visible. As the temperature rises, the spectrum shifts towards shorter wavelengths. At temperatures around 900 K, part of the radiation becomes visible since wavelengths in the 700 nm region are present and the object start to appear "red hot".
If you think of a blacksmith working a piece of hot iron, the iron glows red because its temperature is around 1'000 K, but the charcoal in the furnace glows the same color because it's at about the same temperature, even if carbon and iron are chemically very different.
At higher temperatures the color of the radiation will tend to yellow, white and white-blue, roughly according to the table below. Please keep in mind that color perception is subjective and different authors report slightly different colors.
Blackbody spectrum
The spectrum of blackbody radiation has a typical bell shape and the emitted energy (integral of the curve) is proportional to the forth power of the absolute temperature (T4): hotter bodies radiate a lot more. The following plot shows the spectrum for temperatures from 273 K (0 °C) to 453 K (180 °C) in 20 °C steps.
one can see, the majority of the radiation is in the long wave infrared, well beyond 5 μm. Almost nothing is emitted in the visible spectrum (roughly 400 to 700 nm). If our eyes could see wavelengths around 10 μm, there would be no such thing as darkness, since all objects at ambient temperature strongly emits and absorbs in this range.
The spectrum is described by Plank's equation:
u(lambda,T)=(8*pi*h*c/(lambda^5))*1/(e^(h*c/(lambda*k*T))-1)