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In case of fiber-optic cables, which transmission mode is used for transmitting data over long distances?

Infrared

Multimode

Radio

Single mode

In fiber-optic communication, a single-mode optical fiber (SMF) is an optical fiber designed to carry light only directly down the fiber - the transverse mode. These modes define the way the wave travels through space, i.e. how the wave is distributed in space.

Ts

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Surian Soosay wikipedia → Single-mode optical fiber

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When was the first electronic computer created and what was its name?

in 1945 - Eniac

in 1943 - Colossus

in 1939 - Atanasoff-Berry ABC

in 1941 - Zuse's Z3 machine

Ubuntu is the most popular Linux distribution, developed by Canonical Software owned by Mark Shuttleworth. What else is Mark famous for?

being a movie star

being an Olympic games attendant

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owning a submarine

What material is computer's processor made of?

single crystal ruby

single crystal silicon

silicon polycrystal

Radio waves and microwaves are used in which of the following communications?