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Additional
atomic clock
English Wikipedia - The Free Encyclopedia
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Atomic clock
An
atomic clock
is a
clock
device that uses an
electronic transition
frequency
in the
microwave
,
optical
, or
ultraviolet
region of the
electromagnetic spectrum
of
atoms
as a
frequency standard
for its timekeeping element. Atomic clocks are the most accurate
time
and
frequency standards
known, and are used as
primary standards
for international
time distribution services
, to control the wave frequency of television broadcasts, and in
global navigation satellite systems
such as
GPS
.
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