. The Bell System technical journal . om, uranium Al, of which the electronic spectrum isshown in Fig. G (from an article by Frl. Meitner). This displaysthree lines made by electrons of which the speeds indicate that theyare extracted from the L, M and A^ levels of the atom by a singleradiation, having itself the frequenc>- of the natural Aa-radiation ofthe atom. This radiation was itself delected and identified l)\- ap-propriate means. Faster electrons which were also observed, cannothave been derixed from an\- such source; tiie\ came frnni . /.V Il
. The Bell System technical journal . om, uranium Al, of which the electronic spectrum isshown in Fig. G (from an article by Frl. Meitner). This displaysthree lines made by electrons of which the speeds indicate that theyare extracted from the L, M and A^ levels of the atom by a singleradiation, having itself the frequenc>- of the natural Aa-radiation ofthe atom. This radiation was itself delected and identified l)\- ap-propriate means. Faster electrons which were also observed, cannothave been derixed from an\- such source; tiie\ came frnni . /.V IlnsiCS 11 165 the luirk-us, ;iiul st>n\e of them ejrct floctroiis from tlie \rl of tlicatom, thus producing the neci-ssai^ condition for the ^n-radiationand all the others to be emittetl. These electrons from the A-levelWf)uld escape with too little energy to he registered in the ciueslion of the ultimate origin of these fastest electrons is, how-ever, still under debate by the leading authorities on the 1-ig. 6 Imagine now that a beam of X-ra\s iiukiiliii!; all frecjuencies isdirecteectrum projected against a photographicplate in the usual manner. Rays of frequency v can extract electronsfrom a particular level when ht> exceeds the value of W for that level,but not otherwise. Advancing along the spectrum in the directionof increiising frequencies, we should expect to find a sudden sharpweakening of the transmitted rays wherever the frequency becomesequal to one of the values W/k which characterize the various of I,, de Broglies classical photographs are shown in Fig. 7(borrowetl from Millikans book, The Electron). The secondpicture from the top represents two spectra of an X-ray beam trans-mitted through molybdenum, one spectrum stretching away to theright from the central dark band, the other to the left. The fre-quency decreases as the distance from the dark band incre
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
