DOC.

62

399

Doc. 62

"Discussion"

following

lecture version of Fritz

Hasenöhrl,

"On

the Transformation of Kinetic

Energy

into

Radiation"

[Physikalische

Zeitschrift

10

(1909):

830]

[1]

Einstein:

Of

course,

in this

case

the irregular fluctuations

would be

exactly such

that Maxwell's distribution

law would

be

maintained, i.e., that

the

damping

would be

compensated

by

the irregular

impacts.

Lecturer:

I

am

not

sure

that

I

understand

you

correctly.

You

mean,

if

you

think

of

a

closed

container,

and

particles

are moving

in

it,

that

they

wouldn't

be

damped by

radiation

at

all?

Einstein: That's right.

Lecturer: I

am

getting

noticeable

damping

of

motion only

after

a

practically infinite time.

Planck:

The

two

gentlemen

start

out

from

different

assumptions.

The

lecturer considers

an

entirely uniform radiation intensity, while

Mr.

Einstein

considers radiation

fluctuations,

and

therefore

he

also

gets

fluctuations in

the resulting

effects, i.e.,

not

a

complete

damping.

[3]

[2]