what are cathode rays?

Answer 1

Cathode rays are electrons which are emitted from gases trapped inside a cathode ray tube.

A cathode ray tube is a glass tube from which most of the air has been evacuated. The tube has electrodes placed at each end and a high-voltage current is passed through the electrodes.

A ray is produced at the cathode (negative pole) and travels to the anode (positive pole). The ray is called "cathode ray" because it comes from the cathode.

JJ Thomson used cathode ray tubes to demonstrate that the cathode ray responds to both magnetic and electric fields. Since the ray was attracted to a positive electric plate placed over the cathode ray tube (beam deflected toward the positive plate) he determined that the ray must be composed of negatively charged particles. He called these negative particles "electrons."

Answer 2

Cathode rays are streams of electrons observed in vacuum tubes, i.e. evacuated glass tubes that are equipped with at least two electrodes, a cathode (negative electrode) and an anode (positive electrode) in a configuration known as a diode.

When the cathode is heated, it emits some radiation which travels to the anode. If the inner glass walls behind the anode are coated with a phosphorescent material, they glow. A metal shape placed between the electrodes casts a shadow on the glowing coating. This suggested that the cause of the light emission was comprised of rays emitted by the cathode and hitting the coating. They travel towards the anode in straight lines, and continue past it for some distance.

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Answer 3

What Are Cathode Rays

Answer 4

Cathode rays are streams of electrons observed in vacuum tubes, i.e. evacuated glass tubes that are equipped with at least two electrodes, a cathode (negative electrode) and an anode (positive electrode) in a configuration known as a diode.

When the cathode is heated, it emits some radiation which travels to the anode. If the inner glass walls behind the anode are coated with a phosphorescent material, they glow. A metal shape placed between the electrodes casts a shadow on the glowing coating. This suggested that the cause of the light emission was comprised of rays emitted by the cathode and hitting the coating. They travel towards the anode in straight lines, and continue past it for some distance

Answer 5

The cathode (as opposed to anode) is the negative end of a vacuum tube. When Thompson did his experiment, electrons came from the negative end and some substance (name escapes me) glowed inside the tube when a current was passed through it. It looked like the "ray" (really the beam of electrons that exited the compound, causing it to glow) and so it was called a cathode ray tube, with a cathode ray inside. (It's what is in those big screens and TVs.)

Answer 6

Cathode rays :
- Cathide rays are streams of electrons observed in vacuum tubes, i.e. evacuated glass tubes that are equipped with at least two electrodes, a cathode (negative electrode) and an anode (positive electrode) in a configuration known as a diode.

-When the cathode is heated, it emits some radiation which travels to the anode.
-If the inner glass walls behind the anode are coated with a phosphorescent material, they glow.
-A metal shape placed between the electrodes casts a shadow on the glowing coating. This suggested that the cause of the light emission was comprised of rays emitted by the cathode and hitting the coating.
-They travel towards the anode in straight lines, and continue past it for some distance.
-Cathode rays propagate in a straight line in the absence of external influences, but are deflected by electric or magnetic fields (which can be produced by placing high-voltage electrodes or magnets outside the vacuum tube - this explains the effect of magnets on a TV screen). The refinement of this idea is the cathode ray tube (CRT), also known as Braun's tube (because it was invented 1897 by Ferdinand Braun).
- The CRT is key to television sets (though alternative display technologies are making inroads), oscilloscopes, and vidicon television cameras.

-In addition to their use within cathode ray tubes, higher energy beams of relativistic electrons (generated by various types of electron beam accelerators) are used extensively within many industries to perform precision electron beam welding, rapid curing of thermosetting plastics, and cross-linking of thermoplastics to improve their physical properties.

-Recent developments in electron beam accelerator technology include compact modular KeV accelerators which are being adopted by consumer packaging, medical device sterilization, and air treatment applications.
-These devices produce far less x-ray radiation than MeV accelerators with housings that look like early microwave ovens as opposed to lead lined concrete bunkers.

Answer 7

cathode rays are nothing but a beam of electrons .cathode ray tube is the main part of the television and monitor,etc.
this cathod ray tube is a glass tube which has two electrodes at high potential difference at very low pressure .due to the low pressure and high potential difference elecctrons start flowing from one elecrode to anothere through the vaccume these rays of electrons are called cathode rays as the are emmitted from the cathode( negetively charged electrode).

Answer 8

Cathode rays are electron beams in a vacuum tube. The best example of this which you see everyday is a TV tube.

Answer 9

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what are cathode rays?

Answer 10

cathode rays are nothing but stream of electrons that travel in straight lines.They travel with a velocity upto one tenth of the velocity of light and they affect photographic plates.They can produce X-rays when they strike a solid substance of large atomic weight.They can also produce fluorescence and heat when they fall on suitable matter.