It shows J.J.Thomson's contribution in the field of atoms

9. CATHODE RAY TUBE.
The cathode ray tube (CRT) is a vacuum
tube containing one or more electron guns
(a source of electrons or electron emitter)
and a fluorescent screen used to view
images. It has a means to accelerate and
deflect the electron beam(s) onto the
screen to create the images.
 The images may represent electrical
waveforms (oscilloscope), pictures
(television, computer monitor), radar
targets or others.
 CRTs have also been used as memory
devices, in which case the visible light
emitted from the fluorescent material (if
any) is not intended to have significant
meaning to a visual observer (though the
visible pattern on the tube face may
cryptically represent the stored data).

11. Cathode:
The cathode is the negatively
charged electrode.
The cathode attracts cations or
positive charge.
The cathode is the source of
electrons or an electron donor. It may
accept positive charge.
Anode:
The anode is the positively charged
electrode.
The anode attracts electrons or
anions.
The anode may be a source of
positive charge or an electron
acceptor.

12. THOMSON’S EXPERIMENT WITH CATHODE RAY
DISCHARGE TUBE
Experiments on the magnetic
deflection of cathode rays:
Thomson first investigated the
magnetic deflection of cathode rays.
Cathode rays were produced in the
side tube on the left of the apparatus
and passed through the anode into the
main bell-jar, where they were
deflected by a magnet.
Thomson detected their path by the
fluorescence on a squared screen in
the jar.
He found that whatever the material
of the anode and the gas in the jar,
the deflection of the rays was the
same, suggesting that the rays were
of the same form whatever their
origin.

13. THOMSON’S EXPERIMENT WITH CATHODE RAY
DISCHARGE TUBE

14. Thomson constructed a Crookes tube with a
near-perfect vacuum. At the start of the tube
was the cathode from which the rays projected.
The rays were sharpened to a beam by two metal
slits – the first of these slits doubled as the
anode, the second was connected to the earth.
The beam then passed between two parallel
aluminum plates, which produced an electric field
between them when they were connected to a
battery. The end of the tube was a large sphere
where the beam would impact on the glass,
created a glowing patch. Thomson pasted a scale
to the surface of this sphere to measure the
deflection of the beam.
When the upper plate was connected to the
negative pole of the battery and the lower plate
to the positive pole, the glowing patch moved
downwards, and when the polarity was reversed,
the patch moved upwards.

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17. DONE BY:
RAHUL SRIVATSAN.M.R.
VISHWANATH.A.
DHANRAJ.D.
SANJAY.S.
GANAPATHY.M.
ABHINAV.R.
SANTHOSH.S.
VIVEK.S.
VARUN PRASATH.B.
AKASH.L.K.

18. THANK
YOU