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Scanning is process of dividing an image on the screen into a large number of very small squares formed by sets of horizontal and vertical straight lines.
Iconoscope is used for the purpose of scanning. It is a type of camera consisting of a cathode ray beam and a photoelectric cell. It is focussed onto an object to be televised. The image of the object formed by the lens of a camera is focussed onto a screen. On the screen, the image is divided into a very large number of every small squares formed by sets of horizontal and vertical straight lines. This process is called scanning
Potential free contacts (also known as "dry contacts") are simply contacts which are physically operated with the main device, but not electrically connected to it. For example a m
In thermodynamics, the Joule-Thomson effect describes a process in which a fluid is forced through a valve or porous plug while kept insulated so that no heat is exchanged with the
Advantages of A.C. transmission of power 1. The power can be produced at high voltages. 2. The maintenance of a.c. sub-stations is simple and cheaper. 3. The a.c. voltage
Solar Cells: The solar cells that we see on calculators and satellites are photovoltaic cells or modules (modules are easily a group of cells electrically connected and packaged
Essential properties of the medium for wave propagation: (i) Elasticity: So that particle can return to their mean position, after having been disturbed. (ii) Inertia : So t
Electromagnetic waves: Electromagnetic waves with different ranges of frequency constitute an electromagnetic spectrum. Electromagnetic waves are transverse in nature. Visible
Friction is a microscopic constant and so macroscopic level area does not matter. But area would matter if the object we''re putting under study was microscopic, which isn''t in o
a lead bullet moves horizontally with a velocity of 130ms and embedded into a cement wall after collision. if the specific heat capacity of lead = 130J/KgC and all heat produces is
How noisy is an illuminator? It is very noisy, slightly so or completely silent, depending upon the power source and the construction. There heat dissipation is something which
Cart and The Brick Collisions among objects are governed through laws of momentum and energy. While a collision occurs in an isolated system, a total momentum of the system of
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