DOC.
38 QUANTUM
THEORY OF RADIATION 233
justified
to
do
so,
because the smallness of the momenta transferred
by
radiation
almost
always pushes
them into the
background
of
reality
when
compared
to
other
[p. 62]
motion-generating
causes.
But in theoretical
investigations
these small effects
are
definitely
as
important as
the
more prominently appearing energy
transfers
by
radiation,
because
energy
and
momenta
are
always intimately
linked
together.
Therefore,
a
theory
can
only
be viewed
as justified
if
it
shows that the
momenta
that
are
transferred from radiation onto
matter
lead
to
motions
as
they
are
demanded
by
the
theory
of
heat.
Additional
notes
by
translator
{1}
The
English
translation of the
missing
German
text,
which
is
quoted
in
note
[14],
has been included here in brackets.
{2}
"dk/dk"
has been corrected to
"dk/dk."
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