Speed of light

The distance from the Sun to the Earth is shown as 150 million kilometers, an approximate average. Sizes to scale.

The Lorentz factor γ as a function of velocity. It starts at 1 and approaches infinity as v approaches c.

Event A precedes B in the red frame, is simultaneous with B in the green frame, and follows B in the blue frame.

The blue dot moves at the speed of the ripples, the phase velocity; the green dot moves with the speed of the envelope, the group velocity; and the red dot moves with the speed of the foremost part of the pulse, the front velocity

The speed of light in vacuum, commonly denoted $c$ , is a universal physical constant important in many areas of physics. Its precise value is 7008299792458000000♠299792458 metres per second (approximately 7008300000000000000♠3.00×10 m/s), since the length of the metre is defined from this constant and the international standard for time. According to special relativity, $c$ is the maximum speed at which all matter and hence 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 $c$ regardless of the motion of the source or the inertial reference frame of the observer. In the theory of relativity, $c$ interrelates space and time, and also appears in the famous equation of mass–energy equivalence $E = mc$ .

单词	Planck speed
释义	Planck speed 英语百科 Speed of light The speed of light in vacuum, commonly denoted $c$ , is a universal physical constant important in many areas of physics. Its precise value is 7008299792458000000♠299792458 metres per second (approximately 7008300000000000000♠3.00×10 m/s), since the length of the metre is defined from this constant and the international standard for time. According to special relativity, $c$ is the maximum speed at which all matter and hence 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 $c$ regardless of the motion of the source or the inertial reference frame of the observer. In the theory of relativity, $c$ interrelates space and time, and also appears in the famous equation of mass–energy equivalence $E = mc$ .
随便看	Vesiculobullous Dermatoses的意思 Vesiculobullous rash的意思 Vesiculobullous Skin Disease的意思 Vesiculobullous Skin Diseases的意思 vesiculocavernous的意思 vesiculocavernous respiration的意思 vesiculogram的意思 vesiculography的意思 vesiculopapular的意思 vesiculopustular的意思 vesiculose的意思 Vesiculosus的意思 vesiculotomy的意思 vesiculotubular的意思 vesiculotymapanic的意思 vesiculotympanic resonance的意思 vesiculous的意思 vesiculoviral的意思 Vesiculovirus的意思 vesiculovirus carp spring viremia的意思 vesiculoviruses的意思 Vesiculovirus genus的意思 vesiculoviruss的意思 vesiculovirus spring viremia of carp virus的意思 vesiculovirus vesicular stomatitis virus的意思

Planck speed

Speed of light