Translate:
English
Chinese (S)
Chinese (T)
Croatian
Dutch
French
German
Hebrew
Italian
Japanese
Korean
Portuguese
Russian
Serbian
Spanish
Swedish
Turkish
Additional
speed of light
English Wikipedia - The Free Encyclopedia
Download this dictionary
Speed of light
The
speed of light
in
vacuum
, commonly denoted , is a universal
physical constant
important in many areas of
physics
. Its precise value is (approximately ), since the length of the metre is defined from this constant and the international standard for time. According to
special relativity
, is the maximum speed at which all matter and
information
in the
universe
can travel. It is the speed at which all
massless particles
and changes of the associated
fields
(including
electromagnetic radiation
such as
light
and
gravitational waves
) travel in vacuum. Such particles and waves travel at regardless of the motion of the source or the
inertial reference frame
of the observer. In the
theory of relativity
, interrelates
space and time
, and also appears in the famous equation of
mass–energy equivalence
.
See more at Wikipedia.org...
© This article uses material from
Wikipedia
®
and is licensed under the
GNU Free Documentation License
and under the
Creative Commons Attribution-ShareAlike License