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Academia - Collins - Pocket Scientific Dictionaries - Physics - English - French - Arabic Letter 1_ T


phone
phone m

phone . A system that allows the transmission of speech as electrical signals in a wire, such as optical signals in a fiber, or as radio signals. A traditional handheld device includes a carbon microphone shown in (a) below, and a simple speaker and speaker (b). Sound waves vibrate the microphone plate and the resistance of the carbon conductor changes - giving the constant applied voltage
Different current.

The loudspeaker combines a magnet and an electromagnet. The change in current causes the iron leaf to vibrate, generating sound.


telescope
telescope m

A telescope. An optical instrument produces magnified images of distant objects. The Galilean type (as in opera telescopes) combines diverging and telescope lenses. The standard refractor has two telescope lenses, which gives more magnifying results, but the tube is longer and the image appears upside down. The reflector telescope has a close-up mirror instead of an object lens (that Closest to the body). The standard radio telescope has the same design but detects radio waves.
See also prism binoculars.

television
television m

television. Transmission of visionary data by radio waves. Voice and computer data are passed in the same way. Transmitting visionary data requires a high frequency, even if the TV is not color. (High frequency means high information content). That's why electronic video circuits are complex.
The fast-moving spot creates an image on the screen with a cathode-ray tube. The stain wipes the surface of the screen fifty times per second. Its brightness varies during this time.

Scan lines on a face on the screen

In addition to radio waves, cables and fiberglass can now transmit video signals. Color television images are formed by making thousands of dots fluoresce in red, green, or blue.


temperature(T)
température f

Temperature The hottest point or level of heat of a substance. It is related to the average energy of the particles of the relevant sample. See kinetic model. There are many types of thermometers that measure temperature, and of course, no thermometer can measure the average energy of a particle itself. There are a number of scales that are used to measure temperature. In daily life, we use the Celsius scale to measure temperature, but the Fahrenheit scale is still in common use in Britain and the United States. The absolute or ther mo-dynamic scale has great value in the field of physics. The table below shows the values ​​of the two main fixed points for each of these stairs.

Ladder -------- Unit

Celsius -------- Celsius, C°
Fahrenheit -------- Fahrenheit degrees
Absolute -------- Kelvin K

Ice point -------- Steam point

°0 ---------- °100m
32°F --------- 212°C
_~213 Kelvin -------- _~ 213 Kelvin

See also gas laws


temporary magnet
Aimant m transitoire

Temporary magnet. See magnetic material.


tension
tensionf

tension . Force in a wire, string, or the like. It is the effect of cohesion in stretched solid or liquid samples, and this effect tends to prevent the sample from breaking up into parts when stretched.
See also elasticity.


terminal velocity
Vitesse f limite

Limit speed. See vicosity.