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Homework Help: Colour and Temprature qustion

  1. Aug 17, 2011 #1
    1. The problem statement, all variables and given/known data

    If a surface which glows red hot at 500C , calculate the approximte temperature at which it glows white hot, explaining your reasoning

    2. Relevant equations
    I have no idea .

    3. The attempt at a solution

    Must b something to do relating wavelength and temperature , like wein's law ..

    Any ideas guys?

  2. jcsd
  3. Aug 17, 2011 #2


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    Homework Helper

    That does seem like a rather vague problem statement, but they are just looking for an estimate. Think about the shape of the blackbody curve. At 500 C, only the "high-energy" end of the distribution has entered the "window" of the "visible" spectrum, so the surface appears dull red. Where might you shift the peak (in wavelength) so that it is roughly centered in that window? (That would give all of the visible wavelengths similar intensities within roughly a factor of 2 or 3.) About what temperature would Wien's Law say that occurs at?

    Hint: this is the situation for stars that "look white".
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