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cm -', this being the value of kp corresponding to a Fermi energy of 4 ev. Because the dependence of R on g is given roughly by R~q 4, the uncertainty in the choice of q does lead to considerable uncertainty in R.Comparison of the theoretical and empirical values of q for sodium enables one to say that, for sodium at least, our estimate of R is not in error by more than a factor of 5.By an approximate integration of (1) it is easily

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