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Definitions (421)

1.

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Parallel Beam


A parallel beam is one which does not diverge or converge - its width stays the same as the beam travels out from its source. Parallel beams are produced using curved (parabolic) reflector dishes (e.g [..]
Source: frankswebspace.org.uk

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Principle of Reversibility


This applies to light rays passing through any system of mirrors or lenses. Basically, it means if a ray of light follows a path when going, say, from left to right, then another ray of light going fr [..]
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Becquerel


This is a measure of the activity of a radioactive sample. One Bq means one nucleus decay per second. So a sample with an activity of 12 Bq is undergoing an average of 12 nuclear decays per second.
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Comet


A comet is a small body orbiting our Sun, usually at great distance from Earth and with a highly elliptical orbit. They are composed of 'ices' and dust. As a comet approaches the inner solar [..]
Source: frankswebspace.org.uk

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Semiconductor


A material whose ability to conduct electricity is roughly half way between that of an insulator and that of a conductor. Semiconductor materials are the foundation of modern electronics, including ra [..]
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Semiconductor


A material that is half way between a non-conductor and a conductor in its ability to carry an electric current. It has special conduction properties.
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Boiling


The process by which liquids change into gases at temperatures at or above the boiling point. It occurs throughout the whole of the liquid.
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Cable


Two or three insulated wires surrounded by an outer sleeve of rubber or plastic. A cable is not designed to be flexible or to be moved about.
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Cathode


(1) In an electrolytic cell, the cathode attracts and reacts with positively charged ions. (2) In a cathode ray tube (and vacuum tubes in general) the cathode collects and conducts electrons. (3) The [..]
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Cathode Ray Tube


This is an evacuated tube containing an electron gun (a source of electrons) and a fluorescent screen used to view images. It has a means to accelerate and deflect the electron beam. The image may rep [..]
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