This problem is to derive the Wien displacement law, Equation 3-5. (a) Show that the energy density
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This problem is to derive the Wien displacement law, Equation 3-5.
(a) Show that the energy density distribution function can be written u = Cλ-5(ea/λ -1)-1, where C is a constant and a = hc/kT.
(b) Show that the value of λ for which du/dλ = 0 satisfies the equation 5λ (1- e-a/λ) = a.
(c) This equation can be solved with a calculator by the trial-and-error method. Try λ = α a for various values of α until λ/a is determined to four significant figures.
(d) Show that your solution in (c) implies λm T = constant and calculate the value of the constant.
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