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CRT Full Form

A CRT is a display screen that produces images in the form of a video signal. Learn more about CRT full form & its applications on Unacademy.

Full Form of CRT

CRT stands for Cathode Ray Tube. Karl Ferdinand Braun created the cathode ray tube, or CRT, in 1897. He was a German scientist who invented the gadget, which consists of an enclosure or tube with one end carrying an electron cannon that travels through the tube. The free-moving electrons collide with the fluorescent tube on the opposite side of the glass tube, resulting in brief flashes that may be monitored electronically. It may be displayed as a graphic or a photograph. The image may be seen afterwards as waveforms on an oscilloscope, or as photographs, for example, for aircraft detection. This innovation is significant because it depicts free electrons in original hues by producing pictures of natural colours. J. J. Thomson was responsible for carrying out the cathode ray experiment. J. J. Thomson was an English scientist who pioneered cathode ray tube research. He was able to uncover the presence of electrons and their characteristics as a result of this experiment, which was a significant achievement in physics and science. The finding earned him the physics Nobel Prize. Other qualities of the electron include its charge and the ability of an electric charge or flow of electrons to propagate across a material.

Cathode Ray Tube

  1. J. Thomson developed a glass tube that was partially evacuated, meaning that all of the building’s air had been drained. He then put a strong electric voltage between two electrodes at each end of the tube. He witnessed a particle stream (ray) travelling from the negative electrode (cathode) to the positive electrode (anode). This beam is referred to as a cathode ray, and the complete structure is referred to as a cathode ray tube.
  2. J. Thomson’s experiment Cathode Ray Tube (CRT) is among the most well-known physics experiments that resulted in the discovery of the electron. Additionally, the experiment might characterise the substance’s distinctive features, most notably its affinity for positive charge and charge-to-mass ratio. This article explains the simulation of J. J. Thomson researched the Cathode Ray Tube. The primary contribution of this paper is a novel way to model the experiment, which employs physical law equations to accurately and precisely characterise the electrons’ velocity. The user may alter and record the electrons’ movement by changing the experimental settings.

The Cathode Ray Experiment Procedure

  • The device is constructed in such a manner that the terminals are exposed to a high voltage while the internal pressure is decreased by expelling air from the tube
  • Due to the high voltage at the terminal, the partial air within gets ionised, and the gas acts as a conductor
  • Current circulates in a closed-loop circuit
  • A dipole was erected to detect and quantify the ray generated
  • Due to the dipole, the cathode rays started deflecting and being repulsed from the dipole and moving towards the anode phosphorescent material. The substance was arranged in such a way that the rays struck it, generating little sparks of light that detect the stream of rays

Cathode Ray Tube Applications

  • Frequently used as a television (TV) display
  • Whenever rapidly cathode rays are abruptly halted, X-rays are created
  • Fluorescent chemicals are used to cover the screen of a cathode ray oscilloscope and the display of a computer. So when cathode rays strike the screen, images appear on the screen

J. Thomson drew a few findings after using this technique. The rays seen as they transitioned from cation to anion were all negative. This then benefited future scientists in comprehending the present atomic structure. Additionally, they discovered that the quantity of voltage, the kind of gas, and its component ratios had no effect on or modifying the natural, physical, and behavioural features of electrons. This established the electron as a self-contained subatomic particle with distinct features and behaviours that were eventually defined by a subsequent generation of scientists.


The discovery of electrons led by sir J.J Thomson via cathode ray tube experiment is one of the most widely regarded experiments in physics. This discovery opened wide gates in the field of science, which significantly helped other scientists to achieve their experiments and discoveries with ease.


Frequently asked questions

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Who was the person who discovered cathode rays?

Answer: Sir J.J. Thomson was the scientist who discovered cathode rays....Read full

What are cathode rays?

Answer:  From the negatively charged cathode, cathode rays are a stream of negatively charged particles known as el...Read full

What was it that Sir J.J. Thomson discovered out?

Answer:  Sir J.J. Thomson was awarded the Nobel Prize for his discovery of el...Read full

What exactly are cathode rays and how do they work? In nature, are they seen as positive or negative?

Answer: Because cathode rays are composed of negatively charged particles known as electrons, the charge contained i...Read full

What is a cathode ray oscilloscope?

Answer: A cathode ray oscilloscope is a laboratory instrument that may be used to display, compute, and analyse the ...Read full