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Homework Help: Black Body Radiation Help

  1. Sep 12, 2013 #1
    Hello! I am hoping someone could help.
    I have no idea where to start on this, and have been flipping pages for an hour or so trying to figure it out.
    Find the spectral range Δλ over which a blackbody's intensity B(1/2) is brighter than half of its peak value B(peak). (In other words, find the difference between the wavelengths where B(1/2) = B(peak)/2)

    I have played with the Planck distribution for so long. Am I beating a dead horse? I can't seem to find out what to do with T in the plank distribution, weins law, stefan-bol..... Some guidance please!

    Planck Distribution B(λ) = [(2hc^2)/(λ^5)][1/(e^((hc)/(λkT))-1)]
    Weins Law λ(max)=b/T

    c=speed of light
    h=planck's constant=6.62606957 × 10-34 (m^2 kg) / s
    k=boltzmann constant=1.3806488 × 10-23 (m^2 kg)/(s^2 K)
    b=wein's displacement constant=2.897768×10^-3 m K
  2. jcsd
  3. Sep 13, 2013 #2


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    2017 Award

    Staff: Mentor

    Please show your work then.
    We cannot see what you did wrong if you don't do that.

    I moved your thread to the homework section, as this is a homework-like question.
  4. Sep 13, 2013 #3
    Hey Sorry I for got to reply! I think i figured it out! Thanks for checking it out!
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