22 DOC.
11
MAY 1914
dependent
on
parameters
or
that
such
a
dependency
be
permitted.
Example.
Electron
in
a
fixed
plane
under
the
influence
of
a
field.
magnet
electron’s path;
respective
v
dependent
on
the
magnet’s position
so
that
also
the
possible
p’s
&
q’s
[apply]
in
taking quantum theory
as a
basis.
One
thing
must be
noted,
though.
The correlation between
S
and
lg
W
is
evident
only
when W
is
understood
as
the
probability
of
a
phase
space
in the
sense of
the
[relative]
frequency
with which it effectuates itself.
(Your
W for
various
parameter
values
a
cannot be
perceived
as
such, however,
as
far
as
I
can
see.)
It
is
in this
sense
that
I believe in
the
exact validity
of
Boltzmann’s
principle.
I
am
also
toiling
with
quanta,
looking
for
a
general
formulation.
But .....
.
It
is
extremely
stimulating
here,
so even
if
only
for
this
reason,
I recommend
your
coming.
In
this
event I
ask
you sincerely, though,
to stay
with
me, considering
that the
connections
everywhere
are
very
convenient.[2]
Franck
and
Hertz have
found
that
electrons in
Hg
atoms
are
reflected
elastically
at
a velocity
of
up
to
4.8
volts;
that
at
this
velocity upon
collision
they
lose
all
their
kin.
energy
and
emit monochromatic
light
in such
a way
that
within
a
few
percentages
Kin.
energy
=
hv.[3]
Wonderful reversal of the
photoelectric phenomenon.
A
striking
verification
of
the
quantum hypothesis.
Finally,
I
beg you
not to
hold
against me my
rash assertion in
my
last letters
that the G's
were
independent
of
a!
To
a
joyful
reunion!
Yours,
Einstein.
Greetings
to
your
wife
and
to
the
dear
little
ones.[4]