In a series of experiments in the 1890's, J.J.Thompson showed that cathode rays, or electrons, are deflected by an electric field, they are bent by a magnetic field, and that their charge to mass ratio is about 1/2000th of that of the proton. Light does not have any of these properties.
Joseph John Thomson was an English physicist who is credited to have discovered electrons. In his experiments with a cathode ray tube, he measure the mass to charge ratio of the cathode rays.
He was experimenting with gas discharge tubes.
It demonstrated the presence of Cathode/X-Rays experimentally.
cause they shine brighter .. (:
Cathode rays are negatives charges
sdfa
he was a British scientists that discovered negatively charged particles, electrons, inside the atom. he proposed a possible structure of the atom (atomic model) called the plum pudding. you can google some images
The cathode "ray' must have been made up of negatively charged particles, now called electrons.
Thompson observed that these rays are negatively electrically charged.
Different subatomic particles were discovered at different times.
The discovery of the subatomic particles demonstrated for the first time that atoms are not the smallest particles of matter. Electron was the first subatomic particle discovered by J.J. Thomson.
J.J. Thomson discovered the negatively charged particles, electrons in 1897.
J.J Thomson
J.j thomson
In 1897, a British scientis named J.J. Thomson.
The evidence for JJ Thomson was that the plum pudding model could not predict why atoms absorbed and emitted spectral lines.
Thomson had two pieces of evidence: 1- No matter what metal he used for the disk, the particles produced were indentical. 2- The particles had about 1/2000 the mass of a hydrogen, the lightest atom. These experiments provided the first evidence that atoms are made of even smaller particles.
Cathode rays are negatively-charged particles.
English Physicist J.J. Thomson (1856-1940)
They are found to be deflected by electric and magnetic field in the specific direction in which a negatively charged particle would get deflected.
The evidence for JJ Thomson was that the plum pudding model could not predict why atoms absorbed and emitted spectral lines.
Generally, the theoretical first is given to Richard Laming of England in 1851. More theoretical work and the term "electron" came from G. Johnstone Stoney between 1874 and 1891. The actual "discovery" is given to J. J. Thomson in 1897.
The cathodic rays beam was deflected by the atomic nucleus.