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Arup Biswas
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From Wien's law it is seen that approx 6500K(Greater than sun's temp) needed to heat a body to blue! But we see so much blue light(uv ray)! Are they formed from any different mechanism rather than heating?
Wein's law just describes the peak of the black body spectrum. A black body produces wavelengths both above and below the peak wavelength.Arup Biswas said:From Wien's law it is seen that approx 6500K(Greater than sun's temp) needed to heat a body to blue! But we see so much blue light(uv ray)! Are they formed from any different mechanism rather than heating?
Blue light from a blackbody radiator refers to the electromagnetic radiation emitted by a blackbody at wavelengths corresponding to the blue region of the visible light spectrum. A blackbody is an idealized object that absorbs all incoming radiation and emits it at a specific temperature. As the temperature of a blackbody increases, the peak wavelength of its emitted radiation shifts towards the blue end of the spectrum.
Blue light from a blackbody radiator is produced through a process called thermal radiation. As the temperature of a blackbody increases, the atoms and molecules within it begin to vibrate and emit electromagnetic radiation. At lower temperatures, this radiation is mostly in the infrared region of the spectrum, but as the temperature increases, the peak of the emitted radiation shifts towards the blue end of the spectrum.
Blue light from a blackbody radiator has several scientific and practical applications. It is used in astronomy to study the temperature and composition of stars, as different types of stars emit different amounts of blue light depending on their surface temperature. In everyday life, blue light from blackbody radiators is used in various technologies, such as LED lights and computer screens.
The color of blue light from a blackbody radiator changes as the temperature increases. At lower temperatures, the emitted radiation appears more reddish in color, while at higher temperatures, it shifts towards blue. This change in color is due to the shift in the peak wavelength of the emitted radiation, which is determined by the temperature of the blackbody.
The Planck blackbody radiation law describes the amount and distribution of electromagnetic radiation emitted by a blackbody at a given temperature. It states that the intensity of the emitted radiation is directly proportional to the temperature and the frequency of the light. This means that as the temperature of a blackbody increases, the intensity of the emitted blue light also increases, and the peak of the emission spectrum shifts towards the blue end of the spectrum.