Science class,with your teacher-Meteor

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Science class,with your teacher-Meteor

Post  Meteor on Thu Aug 12, 2010 4:18 pm

In today's lesson we are going to talk about the speed of light.

The speed of light, usually denoted by c, is a physical constant important in many areas of physics. Light and all other electromagnetic radiation always travel at this speed in vacuum, regardless of the motion of the source or the inertial frame of the observer. Its value is exactly 299,792,458 metres per second[1] (approximately 186,282 miles per second). In the theory of relativity, c connects space and time, and appears in the famous equation of mass–energy equivalence E = mc2.[2] The speed of light is the speed of all massless particles and associated fields in vacuum, and it is predicted by the current theory to be the speed of gravity and of gravitational waves and an upper bound on the speed at which energy, matter, and information can travel.

The speed at which light propagates through transparent materials, such as glass or air, is less than c. The ratio between c and the speed v at which light travels in a material is called the refractive index n of the material (n = c / v). For example, for visible light the refractive index of glass is typically around 1.5, meaning that light in glass travels at c / 1.5 ≈ 200,000 km/s; the refractive index of air for visible light is about 1.0003, so the speed of light in air is very close to c.

Ole Rømer first demonstrated in 1676 that light travelled at a finite speed (as opposed to instantaneously) by studying the apparent motion of Jupiter's moon Io. After centuries of increasingly precise measurements, in 1975 the speed of light was known to be 299,792,458 m/s with a relative measurement uncertainty of 4 parts per billion. In 1983, the metre was redefined in the International System of Units (SI) as the distance travelled by light in vacuum in 1⁄299,792,458 of a second. As a result, the numerical value of c in metres per second is now fixed exactly by the definition of the metre.

In the next lesson we are going to talk about the theory of relativity,any volunteers?


Last edited by Meteor on Thu Sep 16, 2010 1:34 pm; edited 1 time in total

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Re: Science class,with your teacher-Meteor

Post  Meteor on Thu Aug 12, 2010 4:19 pm

*crickets sound*

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Re: Science class,with your teacher-Meteor

Post  Mr_Vldt on Thu Aug 12, 2010 9:59 pm

Sleep Sleep Sleep Sleep

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Re: Science class,with your teacher-Meteor

Post  Mr_Vldt on Thu Aug 12, 2010 9:59 pm

Mr_Vldt wrote: Sleep Sleep Sleep Sleep

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Re: Science class,with your teacher-Meteor

Post  Mr_Vldt on Thu Aug 12, 2010 10:00 pm

Mr_Vldt wrote:
Mr_Vldt wrote: Sleep Sleep Sleep Sleep

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Re: Science class,with your teacher-Meteor

Post  Mr_Vldt on Thu Aug 12, 2010 10:00 pm

Mr_Vldt wrote:
Mr_Vldt wrote:
Mr_Vldt wrote: Sleep Sleep Sleep Sleep

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Re: Science class,with your teacher-Meteor

Post  Mr_Vldt on Thu Aug 12, 2010 10:01 pm

Mr_Vldt wrote:
Mr_Vldt wrote:
Mr_Vldt wrote:
Mr_Vldt wrote: Sleep Sleep Sleep Sleep

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Re: Science class,with your teacher-Meteor

Post  Zeke on Fri Aug 13, 2010 12:11 pm

I am firing my lazor!
:shoop: :shoop: :shoop: :shoop: :shoop: :shoop: :shoop: :shoop: :shoop: :shoop: :shoop: :shoop: :shoop: :shoop: :shoop: :shoop: :shoop: :shoop: :shoop: :shoop: :shoop: :shoop: :shoop: :shoop: :shoop: :shoop: :shoop:
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Re: Science class,with your teacher-Meteor

Post  Mr_Vldt on Fri Aug 13, 2010 3:34 pm

This is interesting! Smile

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Re: Science class,with your teacher-Meteor

Post  Meteor on Fri Aug 13, 2010 4:12 pm

No volunteers?Ok,I'll start.*clears throat* *cant clear it* *dies*


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Re: Science class,with your teacher-Meteor

Post  Trakais on Fri Aug 13, 2010 8:23 pm

Sleep Sleep Sleep Sleep Sleep



:shoop: :shoop: :shoop: :shoop:


*Bites Meteor because he did a boring story wich i cant even read.*
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Re: Science class,with your teacher-Meteor

Post  Meteor on Sat Aug 14, 2010 10:04 am

Wow you would bite a dead man? o.O

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Re: Science class,with your teacher-Meteor

Post  Trakais on Sat Aug 14, 2010 12:00 pm

Yup, i always have some sugar in my pocket Razz Then u would be tasty :shoop:
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Re: Science class,with your teacher-Meteor

Post  KillerShark57 on Thu Sep 16, 2010 1:16 am

Lol.
Meteor, you spelled science wrong in the title by the way.
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Re: Science class,with your teacher-Meteor

Post  Meteor on Thu Sep 16, 2010 1:34 pm

OH SH*T IM AN IDIOT


Last edited by Meteor on Thu Oct 21, 2010 4:09 pm; edited 1 time in total

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Re: Science class,with your teacher-Meteor

Post  Mr_Vldt on Thu Sep 16, 2010 8:18 pm

Meteor wrote:OH SH*T IM AN IDIOT
yup...












































Jk... lol!

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Re: Science class,with your teacher-Meteor

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