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April 24, 2014

April 24, 2014

Posted by **bob** on Thursday, October 21, 2010 at 3:55am.

- physics -
**drwls**, Thursday, October 21, 2010 at 8:23amIs E^2/(e^(E/T)-1) the function n(E,T) that you want to differentiate?

Is E = h*f/k where f is a frequency, h = Planck's constant and k is Boltzmann's contant? The dimensions of E and T must be the same.

It looks like you are trying to derive the formula for the peak frequency of the Planck blackbody function.

In any case, just use the rule for dfferentiating the derivative of the ratio of two functions.

d/dx (f(x)/g(x)) = [g(df/dx - f*dg/dx]/g^2

In your case, x = E, f(E) = E^2 and g(E) = e^(E/T) -1

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