2007-02-14 21:02:34 · 10 answers · asked by Anonymous in Science & Mathematics ➔ Physics
speed of light is not conatant in all mediums..., cos da maximum speek of 300K per second is in vaccum, ..but it will decrease by passing thru medium with diffrent density...., even when its pass thru gases like nitrogen or when it gets to hydrogen it slightly changes..
2007-02-14 21:10:39 · answer #1 · answered by joffinbabu 1 · 2⤊ 0⤋
The speed of light in any medium is given by the formula
v = ( 1/µ ) x 3 * 10^8 m/s
And it is a constant for any medium and depends upon the value of µ
For vacuum the value of µ = 1.
Therefore, it is equal to 3 * 10^8 m/s in vacuum and is a constant for vacuum.
For all other medium the value of µ > 1 and hence the speed is less than 3X10^8 m/s.
2007-02-14 23:25:01 · answer #2 · answered by Pearlsawme 7 · 0⤊ 0⤋
With light you can measure the wave length and the frequency. The speed of light is constant in a vacuum. This means that any experiment in a vacuum where you multiply wave length and frequency you get c.
It does not matter if there is any combination of relative motion or gravity or whatever. The apparent contradictions are explained as dilation in space and time.
2007-02-14 21:17:11 · answer #3 · answered by Roy E 4 · 1⤊ 0⤋
The speed (or rather the velocity) of light in a given medium is constant in vacuum.In a medium it may be lower than the velocity in vacuum but still is constant in that medium if the medium is homogeneous.
2007-02-14 21:14:46 · answer #4 · answered by Swamy 7 · 0⤊ 0⤋
The speed of light is one of the founding elements of the theroies of Relativity. Scientists are still debating recent experimental results which seem to prove that the speed of light varied over the age of the Universe.
2007-02-14 21:11:13 · answer #5 · answered by ag_iitkgp 7 · 2⤊ 0⤋
According to einsteins equation it is constant;E=mc2 Where cis a constnt of speed of light. however according to new researches the speed of light varies with Gravity. it i s still considered, while solving equations, that is a constant.
2007-02-14 21:11:25 · answer #6 · answered by Answer_paperboy 2 · 0⤊ 0⤋
as long as it is in a gasless environment. if not, the gasses slow the light slightly,
technically the speed of light as a mathematical number doesn't change 299,792.458 km/s
2007-02-14 21:14:22 · answer #7 · answered by Kevy 7 · 0⤊ 0⤋
As far as we know, it is constant in a vacuum. When it is affected by atmospheres of planets it is distorted, therfore slowing down slightly.
2007-02-14 21:11:16 · answer #8 · answered by Anonymous · 2⤊ 0⤋
the speed of light in a *vacuum* is constant.
it is slower in other mediums, eg air.
2007-02-14 21:07:04 · answer #9 · answered by aeronic 2 · 2⤊ 0⤋
yes it is contant
equal to 300000000 m/s
2007-02-15 01:20:46 · answer #10 · answered by falcon 1 · 0⤊ 0⤋