Which of the following scientists observed that cathode rays consist of negatively -charged particles?
Which of the following scientists observed that cathode rays consist of negatively -charged particles?
The correct option is B J.J.Thomson
The explanation for the correct option
Option B, J.J.Thomson: The nature and existence of electrons in an atom were discovered by J. J. Thomson in 1897.
In the discharge tube, on applying a high voltage at low gaseous pressure, the negatively charged particles are emitted from the surface of the cathode.
These negatively charged particles were called electrons.
The explanation for incorrect options
Option A John Dalton: John Dalton gave a theory in 1805 developed the concept of atomic weights and placed the atomic hypothesis in a useful scientific theory.
Option C E.Goldstein: The presence of positively charged particles in an atom was provided by the experiment of E.Goldstein in 1886.
These were also called anode rays as they discharge from the anode.
Option D J.Chadwick: In 1932, James Chadwick bombarded lighter elements with alpha particles and observed the emission of highly penetrating radiation.
He proposed that these radiations consist of neutral particles called neutrons.
Thus Option B, E. Goldstein is the correct option.
J.J.Thomson
The explanation for the correct option
Option B, J.J.Thomson: The nature and existence of electrons in an atom were discovered by J. J. Thomson in 1897.
In the discharge tube, on applying a high voltage at low gaseous pressure, the negatively charged particles are emitted from the surface of the cathode.
These negatively charged particles were called electrons.
The explanation for incorrect options
Option A John Dalton: John Dalton gave a theory in 1805 developed the concept of atomic weights and placed the atomic hypothesis in a useful scientific theory.
Option C E.Goldstein: The presence of positively charged particles in an atom was provided by the experiment of E.Goldstein in 1886.
These were also called anode rays as they discharge from the anode.
Option D J.Chadwick: In 1932, James Chadwick bombarded lighter elements with alpha particles and observed the emission of highly penetrating radiation.
He proposed that these radiations consist of neutral particles called neutrons.
Thus Option B, E. Goldstein is the correct option.
