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Atomic structure
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, 1 Dalton's atomic theory is sucessful at explaining law of conservation of mass,
law of constant composition ,
and law of multiple proportion Very successfully .
.
2 The electical discharge through gases could be observed only at Very low
Pressures and at
very high voltages .
Stream of Particles
more from caltode
to anode .
(Catcode ray)
--
InS(Phosphorescent)
.
3
Summary of Cathode
ray to be experiment :
1) Cathode ray Start from Catcode and more towards anode
2) These are visible but can be observed with fluorescent
phosphorescent TV picture
lobes calcode tube
or are
ray
.
and TV screen is coaled with fluorescent
3) in absence of electrical or
magnetic field, these rays travel
in Stline .
4) in
presence of elechical
magnetic field it
or behaves as
-
ve
charged ,
suggesting ray containing elections .
, 5) The characterstics of
Cathode
Vay do not depend upon
material of electrode and the nature of the
gas present
in the cathode
ray tube
.
40 - electic
> only field
>
-
Es are balanced
> only
magnetic
field
.
·
more magnitude of-ve charge greater the deflection
·
lighter the
particle, more deflection :
·
deflection of electron increases with increase in
voltage across the electrodes :
=> = 1 .
758X10" (k) => J ] thomson measured
.
me
this ratio .
.
5 The found RA Millikan
Charge of electron :
charge of electron was out by
by oil drop experiment to be -1 6 . x10 -
e
of found 9109Xly
me
·
mass is out by =
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