﻿728 Mr. A. Bramley on Radiation. 



Now, if the electron is revolving around in a circular 

 orbit, a suggestion of which we have just availed ourselves, 

 then the radiation ought to experience a centrifugal 

 force. 



The equation of equilibrium will be 



kirpa da.y . -j— = — r\ 



or E=^.l.(a>r 2 )a.a> 



4*1 c 2 

 = jQ40'~(ur 2 )27ra.v. 



But cor 2 = const, according to the theory of central forces, 

 since the radiation force acts along the axis of Z, whereas 

 the plane of revolution is the XY plane. 



7 4-1 9xl0 20 SQ , ,3/2 rx 



= 5'92.10- 27 app. 



Both of these values are very nearly coincident with the 

 experimental values of h, for our knowledge of a is very 

 limited. 



There is also another remarkable coincidence in these 

 values. They show that the momentum due to radiation is 

 identical with that due to the centrifugal force ; another 

 example of the Principle of Equivalence. 



It is hardly necessary to add that this equation E = hv has 



been made the starting-point of the quantum theory of 



stationary states. * ^ 



J Arthur Bramley. 



2167 Kincaid Street, 



Eugene, Ore., U.S.A. 

 August 20, 1921. 



