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Thread: Colour according to temperature

  1. #1 Colour according to temperature 
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    Hello!

    Everyone know that a heated body has colour depending on temperature. It goes from reddish colors (cold heating) to white and then to blue (hottest stars).
    On this subject, a website dedicated to find Science in religious scriptures
    claimed that if one heated up a body at an infinite temperature, it would theorically look black, because the wavelenght of emited radiation will be 0.

    See: http://www.kaheel7.com/eng/index.php...olours-of-fire

    Is their assertion supported by physicists?


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  3. #2  
    Reptile Dysfunction drowsy turtle's Avatar
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    What you're actually seeing is the average wavelength of visible light emitted. Since the object will still be emitting visible light, and probably at infinite intensities, you would see it as white.

    Except that the infinite number of photons would vapourise your eyes, and the rest of the universe.


    (consider that the object will not emit a single frequency, but all frequencies at different intensities;



    ^ The black body curve of some random object. With infinite temperature, the curve will peak at 0 I suppose, but visible light will still be emitted.)


    "The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at or repair." ~ Douglas Adams
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  4. #3  
    Reptile Dysfunction drowsy turtle's Avatar
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    Oh, and you will not find science in religious scriptures, because they are religious and not scientific. You can try and explain weird passages in terms of science, but all you are doing is basing your interpretation on current scientific understanding, not the other way around; you're "reverse-engineering" science into the scriptures.
    "The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at or repair." ~ Douglas Adams
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  5. #4  
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    Quote Originally Posted by drowsy turtle
    What you're actually seeing is the average wavelength of visible light emitted. Since the object will still be emitting visible light, and probably at infinite intensities, you would see it as white.

    Except that the infinite number of photons would vapourise your eyes, and the rest of the universe.


    (consider that the object will not emit a single frequency, but all frequencies at different intensities;



    ^ The black body curve of some random object. With infinite temperature, the curve will peak at 0 I suppose, but visible light will still be emitted.)
    You got yourself all confused.

    The OP did not understand the differenece between black body radiation and the increase of energy.

    The OP did figure out the increase of energy causes a decrease in wavelength.

    What you and the Op did not understand is the wave particle duality. Since quantum mechanics claims operations in nature are finite, then it cannot be the case the wavelength may be 0 which would be black.

    Further, since David Bohm claims we cannot measure electon speed and position based on a thought experiment, then certainly the universe operates based on David Bohm's brain.

    Let's bow our heads and pray.
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  6. #5  
    Reptile Dysfunction drowsy turtle's Avatar
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    Well, at least you said something both helpful, and thoroughly supported.

    [/sarcasm]
    "The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at or repair." ~ Douglas Adams
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    Black is not a color, but the absence of visible light. In that sense you could say that ultraviolet light is "black" but so is infrared, which is the light emitted by the cold black body.

    The quran claim is silly. it is just a matter of people combing through the scripture looking for some correlation with science facts. Occasionally they stumble upon something, just as you can sometimes see shapes of objects in clouds.

    Jeane Dixon and Nostradamus made lots of predictions, and a few of them came true, just by luck. That does not mean they were divinely inspired prophets.
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  8. #7  
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    Quote Originally Posted by Harold14370
    The quran claim is silly.
    Well yeah. But while Christians often oppose science as a threat to their religion, at least Muslims strive for agreement. Good intentions are always welcome.
    A pong by any other name is still a pong. -williampinn
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  9. #8  
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    thanks for your answers.

    drowsy turtle, I don't beleive in the idea religious scriptures contain scientific anticipations, my point is to check whether the claim made by the website is correct or not.


    Harold said:
    Black is not a color, but the absence of visible light. In that sense you could say that ultraviolet light is "black" but so is infrared, which is the light emitted by the cold black body.
    According to the website, the body would be black, not in the sense it's invisible, but in the sense it LOOKS very dark to the human eye like petroleum colour.

    This stuff is based on an islamic tradition that says:
    hell-fire was heated up for millennia to become red, then heated up for millennia to become white and finally heated up for millennia to become dark black.

    This would imply that, to look black, a infintely hot body would absorb all the colours of visible light. Too strange!
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  10. #9  
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    Quote Originally Posted by termina
    This stuff is based on an islamic tradition that says:
    hell-fire was heated up for millennia to become red, then heated up for millennia to become white and finally heated up for millennia to become dark black.

    This would imply that, to look black, a infintely hot body would absorb all the colours of visible light. Too strange!
    This may be a reference to the tempering of metal. Metal is often heated and cooled in different stages in order to get maximum pliability and strength. Often color was used to judge when a stage was done. A dark blue color is the end point of one stage, if I recall correctly.
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