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Re: [Phys-l] light bulbs


On 2011, Mar 08, , at 12:57, Karshner, Gary wrote:

Also with that much temperature change could you still get away with a simple linear term for the temperature correction. I would expect the higher order derivative terms in the Taylor would be getting important.


Not "really".

I just plotted W resistivity from 1100 K to 3400 and fitted it to both a lin. and three term poly. The R^2 values, respectively, are 0.99927 and one! The data **is from Jones and Langmuir as given by Levi "Applied Optics", 1968

rho = -9.8198 + 0.03354 * T

rho = -3.1897 + 0.026281 * T + 1.8486E-6 * T + -1.0038E-11 * T


** being lazy I plotted only twelve points.

bc the one causes bc to wonder if J. and L. fudged.