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Homework Help: Introductory Astronomy Question - function help

  1. Sep 12, 2009 #1
    The question asks to find a new expression for a function, by substituting suitable expressions for the elimination of lambda and T.
    The function is:
    b(x)= h^4 * c^3 * U(sub-lambda) / 2*(kT)^5
    In this case:
    U(sub-lambda)= U(sub-lambda)(lambda,T) - Planck Blackbody Function
    x= lambda*k*T / h*c

    I assume that there is some way to substitute some of the equations into the function - but I am at loss to see how - any help would be appreciated - Thank You
  2. jcsd
  3. Sep 15, 2009 #2


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    Were you given an expression for Uλ(λ,T)? Perhaps in your text book or lecture notes ... I think the next step would be to substitute that expression into the RHS of your b(x) equation here.
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