1922.] Indian Science Congress. LS.C.' 175 
origin in the vibrations of the wer, take the more probable concep- 
tion that the external electrons are concerned. Firstly, it may be proved 
that a gees meen ive electron recenvings in an orbit must radiate ener- 
gy into space. As it radiates, the total energy of the atom changes and 
therefore — the ieacene cy of the oscillations ; eventually the electron 
would f to the central + charge. Thus a gas made up of atoms of 
this tind! Syate show a continuous spectrum and not sharp lines, since in 
an observed mass of gas there would exist atoms giving every possible 
peaeney. 
eee words, sharp lines Semen that the radius of the orbit 
shoul be constant or that it should have a definite number of possible 
stable alciea to which it could jump seonbestaecanal y. Now no possible 
application of Nawteninn: dynamics could account for discontinuity of 
is kind i th a t i i i 
—- 
— 
~ 
8 
between the solid results of Peeadtntce and the aplication of his an- 
cient and rinbes dynam cal syst Som peg a - and for the 
moment, the old dynamics is andes citictale she  satidae trial. 
The bold apeputukion of Bohr hing ch di fat ap “the Begone system, 
is not quite new in kind. Speculat ns of the same nat were first put 
forward by Planck in 1901 in co ashen with thermal gadiitian. But I 
propose to © consider the assumption of Bohra 
lf w is the frequency in the orbit he assumes that the angular mo- 
mentum of the electron in its orbit=rT. = where / is a universal constant 
T 
(the same as was used by Planck) and 7 is an integer, which may be 
POLES 
1, 2,3, ete. Thus the angular momentum, | which is _ x loss of energy 
h h 
of the electron | is equal to 1 x me or to 2x Pe or to 3x z and so on. In 
7 
other ot ds the angular momentum is conceived to change by jumps. 
S gives dente fixed values, for the loss of energy ; som the radius 
of the Ser, and for the frequency, ‘corresponding to each integer. 
s cannot change unless 7 changes, no oscillations in 
ra ; 0 i d is always 
occur energy is radiated and is sheclately aa = ae = _ 
t iation i 
Moe me amount hy where » is the frequency of the agg spend atom. 
this reasoning Bohr deduces very simply ¢ an exact statement o 
the empire law of Balmer. 
are, however, other bear = conceptions of the a stan Redegger 
also esognat for Balmer’s law. The secondary spectrum rem 
present pamiinirsi for. : 
only endeavoured to indie the barest sien of a lar 
subject in in onder a asize the fact that SOME TH 

rv ia ar more 
iverse than has “tinarte been sus- 
her important attempt to ie ae the a, ap of spectral — 
t the atom ce 
is due to Ritz in 1908. The assum — of sonal ecgarectiaert srk 
tains ged e mechanism sce aes sa : pheenmt Saad he wakes 
Is pure assumpti h sek te 
ag ete ate - to account adh: Ratan Said field exists in the es So 
electron daeekie an orbit in the atom, it is poss! f ge 
sion for the frequency which is the same as eciees Pa 
