'
2—3.
THE METHOD OF LENARD
25
Instead of measuring the velocityand the charge—to—mass
ratio of electrons emitted by,a hot lamentJ Lenard4 made his
observations on photo—electrons emitted
a
cold metal plate
irradiated with light. Since his value of e/ m was in rough agree—
ment With that of Thomson he concluded, correctly, that these
charged particles were the same as cathode rays. More recent
--Ë—
H)
.
,
'
Flo. 2—3.
Lenard’s Method
"
’
'
measurements of greater accuracy- have shown
photo-—
:
electrons have. the same ratio of Charge to mass, Whether they come
'
'
from
or another, again showing that electrons are to be '
found widespread throughout the bodies in the world around _us
,
_
and that they existin the atoms of which the matter is built up.
In other
ordinary
matter contains electrical constituents‘."
-_
-
j
_
g
2—3.
THE METHOD OF LENARD
25
Instead of measuring the velocityand the charge—to—mass
ratio of electrons emitted by,a hot lamentJ Lenard4 made his
observations on photo—electrons emitted
a
cold metal plate
irradiated with light. Since his value of e/ m was in rough agree—
ment With that of Thomson he concluded, correctly, that these
charged particles were the same as cathode rays. More recent
--Ë—
H)
.
,
'
Flo. 2—3.
Lenard’s Method
"
’
'
measurements of greater accuracy- have shown
photo-—
:
electrons have. the same ratio of Charge to mass, Whether they come
'
'
from
or another, again showing that electrons are to be '
found widespread throughout the bodies in the world around _us
,
_
and that they existin the atoms of which the matter is built up.
In other
ordinary
matter contains electrical constituents‘."
-_
-
j
_
g