THE RAYS PRODUCED IN A CATHODE TUBE ARE HOW TO
THE RAYS PRODUCED IN A CATHODE TUBE ARE TV

He found that mass to charge ratio was over a thousand times lower than that of a hydrogen ion (H+), suggesting either that the particles were very light or very highly charged.

To do this he measured how far the ray was deflected by a magnetic field. In his 3rd experiment he wanted to see if he could measure the mass to charge ratio (mass divided by amount of charge). Light is not bent by electrical or magnetic fields. This is important as it shows that the rays are not the same as a beam of light. He found the rays did indeed bend, and in the direction expected for a negative charge. In his second experiment he wanted to see if the rays would bend in the presence of an electrical field, which is what you would expect for a charged particle. He found that the rays were bent and the negative charge was bent exactly the same. Thomson set up his cathode ray tube with, but placed a magnet above the path of the rays. He knew that electrically charged objects can be deflected by magnets (Michael Faraday discovered this and is his theory of electromagnetism). In Thomson's 1st experiment he wanted to see if he could separate the negative charge out of the rays. They knew that some sort of ray was coming from the cathode (filament) and that there was some sort of negative charge emitted from the cathode too because an electrical current flowed in the circuit between the screen and the cathode. In reality the power needs to be very high though so you would use mains electricity converted to D.C.Īt the time Thomson started his work, the glow observed on the screen was mysterious and nobody knew what it was. You then connect a second battery with the (+) terminal connected to the screen and the (-) terminal connected to the filament. (It's hard to explain how it is wired up without drawing a picture! Think of it as the filament being connected to a battery - it will glow just like a light bulb but not as brightly. This puts electrical field between the screen and the filament - and if the screen is positive then electrons from the filament will stream towards the screen causing it to glow. At the same time you connect the filament and the fluorescent screen together with an electrical source. You pass an electrical current through the filament and it starts to glow.

THE RAYS PRODUCED IN A CATHODE TUBE ARE TV

At the other end is fluorescent screen which is just like an old fashioned TV screen. Inside at one end is an electrical filament (which is actually called the cathode in this experiment) just like the one inside a light bulb. Characteristics: These rays travel in straight line perpendicular to cathode surface. These rays were named cathode rays because they were originated from cathode. Cathode rays were discovered by Johann Hittorf in the year 1869. These cathode rays travel in a straight-line path at high speed when a voltage difference is applied to the electrodes.

Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.His experiments were all conducted with what is known as a cathode ray tube, so firstly I will try to explain what this is and how it works.Ī cathode ray tube is a hollow sealed glass tube which is under vacuum (has had all the air sucked out of it). When high voltage current was passed through the gas, shiny rays were produced and these rays were emitted from cathode towards anode. Cathode rays are the beam of electrons travelling from the negatively-charged cathode to the positively charged anode at the other end of the vacuum tube.

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THE RAYS PRODUCED IN A CATHODE TUBE ARE HOW TO

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The rays produced in a cathode tube are