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What is the contribution of Eugene Goldstein in chemistry?
Eugen Goldstein was a German physist and was one of the first people to investigate x-rays.Goldstein also discovered Cathode Rays.
What did eugen goldstein contribute in the history of atom?
He is sometimes called the discoverer of protons. He did experiments with cathode ray tubes, which knock electrons off atoms and attract them to a positively-charged electrode (the cathode). He noticed that a second stream of particles was attracted to the negatively-charged electrode (the anode), so he called them anode rays. However, it was left to one of his students to discover that these rays were sometimes pure protons. His experiments gave him a picture of atomic structure that was decades ahead of its time, and similar to what we know today. However, he did not follow up on his work, and was largely ignored by his peers.
What did john Thomson use to deflect the cathode rays?
he dint did nething to deflect them thet went straight to the anode +ve of the tube becoz opposite attracts.
What did Thomson use in his experiments?
J.J. Thomson studied the deflection of cathode rays in electric and magnetic fields.
The em value of cathode rays is always constant but the em value of positive rays is not constant why?
Anode rays differ from cathode rays in several aspects and their specific charge(charge/mass or e/m ratio) is an important feature. The reason lies in how anode rays are produced. Anode rays are produced when a gas at low pressure is subjected to a high voltage(10,000 Volts). Under these conditions, the atoms of the gas get ionized, i.e. they lose some electrons and thus become cations(positive ions). It is a stream of these positive ions that become 'anode rays'. However, the atomic masses of different gases are different and hence, the mass of anode ray particles varies when you use different gases in the discharge tube and hence, the charge/mass ratio also varies. Whereas, in the case of cathode rays, the cathode ray particles are nothing but electrons. Their charge and mass is constant no matter what gas you use in the discharge tube. So, their charge/mass ratio remains constant. (ANSWER BY RIZWAN FROM PAKISTAN)
What was JJ Thompson working with when he discovered the cathode rays?
Electrons.
What particles did Thompson discover and when did he discover them?
J.J. Thompson discovered the electron in 1897 through his experiments with cathode rays. He observed that cathode rays were negatively charged particles that were much smaller than atoms. This discovery led to the development of the plum pudding model of the atom.
Who discovered anode and cathode rays?
Cathode rays were discovered by JJ Thomson and carry a negative charge Anode rays were discovered by Goldstein and carry a positive charge.
What experiment did jj Thompson do?
J. J. Thomson observed that cathod rays are deflected by an electric field - and from this discovered the electron.
Wilhelm Roentgen discovered blank while he was investigating cathode rays?
X-rays
What was discovered in the CRT?
Cathode rays (later revealed to be electrons).
What is Thompson's cathode ray?
homson conducted a series of experiments with cathode rays and cathode ray tubes leading him to the discovery of electrons and subatomic particles. Thomson used the cathode ray tube in three different experiments.
Who discovered canal rays?
Canal rays were discovered by Sir William Crookes in 1870. He observed these rays while studying the behavior of cathode rays in a vacuum tube.
Is it true that Electrons were discovered when an electric current was passed through gases at low pressures?
Yes, Sir J.J.Thompson did exactly that. ( although at that time the terms used for these phenomena were different). In 1897, Thompson heated a metal to produce cathode rays or electrons. These electrons were attracted towards an anode by providing a potential difference between the two electrodes. Between the cathode and electrode was air at very low pressure which did not stop these cathode rays. Sir Thompson studied these beams in the space between the anode and cathode.
Why positive rays called canal rays?
Positive rays are called canal rays because they are positively charged particles emitted by the anode and accelerated through a small canal or channel in the cathode of a cathode ray tube. These rays were discovered by Eugen Goldstein and were later studied by J.J. Thomson.
How was rayon x discovered?
X-rays were discovered accidentally by German physicist Wilhelm Conrad Roentgen in 1895 while experimenting with cathode rays in a vacuum tube. He noticed that a fluorescent screen in his lab started glowing even when it was covered to block the light from the cathode rays, leading to the discovery of X-rays.
What experimrents did jj Thomson?
After experiments with cathode rays Thomson discovered that these rays are deflected in an electrical field; and from this he proposed the existence of electrons.
