EXPERIMENT
(N)
17
radioactive material, such as a radium E tube, for a short time
near the holes in the top plate.
-
Calculatiom.—ll. Average those values of the times of rise of
the drop which are of nearly the same value and, from the micro—
sc0pe calibration, compute the average velocities of rise. Also
compute the average Velocity downward.
_
12. Calculate the value of the approximate radius of the drop
_
from equation 1—8. Also calculate the apparatus and drop constants k1 and 762 from equations 1—12 and 1—13.
13. Calculate the charge gained or lost, using equation 1714.
If the charge did not change during the observations, calculate
the total charge on the drop from equation 1—13. The former
_
procedure is preferable since Ae is usually a smaller multiple of
Ï
the electronic charge than en.
14. From a rough inspection of the data of (13), determine the
number of electrons gained or lost, or the
on
the. drop.
Then divide the charges Ae, or 6… by these integers to obtain
values of 6.
Average these values of €. The individual values ’
-
may uctuate considerablè but their average should be within
,
2% of the accepted value if the experiment has been performed
“
—
correctly.
.
,
.
'
'
.EXPERIMENT 1—2
'
-
AVOGADRO’S NUMBER FROM BROWNIAN MOVEMENTS3
-
oil—drop apparatus is to be used.
«
-
_
«the—instrument
as, described in steps
1to 5 ,0f experiment
‘
“that the
conderiser
_
plates
5Clf:îlft moti9-‘ ?
…
=
'
‘
mustbesmallel”chanthosewhœhcan€uS‘îdf@rthede‘œ“mna
twnoftheeleetwncharäêMeasuœthetlmef@rthede
f°