Author: workhouse123
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THOMSON’S SECOND EXPERIMENT—ELECTROSTATIC DEFLECTION OF CATHODE RAYS
For his second crucial experiment, Thomson reattempted to deflect the cathode rays, much like Hertz had unsuccessfully tried before, but this time pulling a deeper vacuum in the tube. As shown in Figure 46, the cathode rays in his tube were made to pass between two parallel aluminum plates. Contrary to Hertz’s experience, the cathode rays…
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What is the role of information and communication?
Information and Communication Technology can contribute to universal access to education, equity in education, the delivery of quality learning and teaching, teachers’ professional development and more efficient education management, governance, and administration.
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What is the basic concept of information and communication?
Information and Communication Technology (ICT) encompasses various components that facilitate the processing, storage, transmission, and retrieval of information. The basic components include: Hardware:Physical devices such as computers, servers, routers, and smartphones that handle data processing and storage.
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THOMSON’S FIRST 1897 EXPERIMENT—NEGATIVE CHARGE AND RAYS ARE JOINED TOGETHER
Hertz’ (mistaken) finding that cathode rays were not deflected by an electric field was a true mystery, given that cathode rays were so easily bent by magnetic fields. In 1895, French physicist, and later Nobel Prize laureate, Jean Perrin built a CRT to investigate whether or not cathode rays transported charge.10 A diagram of Perrin’s original…
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CATHODE-RAY TUBES
In 1879, Crookes had reached the conclusion that cathode rays must be particles of some sort, observing that they traveled in straight lines and were stopped by metallic objects in their path. As a demonstration, Crookes inserted an electrode shaped like a Maltese cross in the tube, and it cast a sharp shadow on the…
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What is the importance of computational complexity?
Computer scientists use mathematical measures of complexity that allow them to predict, before writing the code, how fast an algorithm will run and how much memory it will require. Such predictions are important guides for programmers implementing and selecting algorithms for real-world applications.
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What are the four types of computation?
Exploring Types of Computational Thinking Techniques. The core of Computational Thinking revolves around four integral techniques: Decomposition, Pattern Recognition, Abstraction, and Algorithmic Thinking. These techniques interplay with each other, creating a cohesive system to solve problems.
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THE DISCOVERY OF THE ELECTRON
Some of the most important experiments to explain radiation were conducted in 1897 by British physicist J. J. Thomson. These experiments led Thomson to the discovery of the electron, for which he received the 1906 Nobel Prize in Physics. The story starts in 1857, when German physicist and glassblower Heinrich Geissler pumped the air out…
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What are the simple models of computation?
Simple model of computation. Input on tape is a finite string with symbols from a finite alphabet. Finite number of states. State transitions determined by current state and input symbol.
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THE ELECTRON GUN
Our CRTs require a beam of electrons, which we produce using the assembly shown in Figure 41. Electrons are stripped off the cathode by a process known as glow discharge between an aluminum cathode rod and a hollow anode. The electron gun is built inside an Ace-Thred #11 connector (Ace catalog number 7644-10). The cathode is a 3/8-in. aluminum…