. From the Bohr theory it is given by the simplest algebra ([Appendix G]) as
As already indicated, in 1917 I redetermined[156]
with an estimated accuracy of one part in 1,000 and obtained for it the value
. As will be shown in the next chapter, I have also determined
photo-electrically[157] with an error, in the case of sodium, of no more than one-half of 1 per cent, the value for sodium, upon which I got the most reliable data, being