, equal to half the frequency of revolution of the electron in its final orbit; then, from Planck's theory, we might expect that the amount of energy emitted by the process considered is equal to
, where
is Planck’s constant and
an entire number. If we assume that the radiation emitted is homogeneous, the second assumption concerning the frequency of the radiation suggests itself, since the frequency of revolution of the electron at the beginning of the emission is
. The question, however, of the rigorous validity of both assumptions, and also of the application made of Planck’s theory, will be more closely discussed in [§3].
Putting