velocity of light?

Answer 1

The velocity of light is taken to be 3 x 10^8 metres per second in a vacuum. (or 2.9998 x 10^8 if being picky.)

Answer 2

Who were the first to calculate the velocity of light?
The Indians.
Rig Veda Bhashyam by Sayana Madhava of 13th century
gives the following Sloka praising the Sun:

Yojanam sahasre dve, satadve, dvecha yojane
Ekena nimeshardhena kramamaana namosthuthe

We know that the Sun is not moving at this speed.
We should deduct that the light from the Sun is moving
at this speed. Adi Kavi Nannaya of 11th century wrote
a poem which gives the same meaning.
One Yojana equals 15788.8 meters, and half of Nimesha
equals 8/75 fraction of a second. This gives the velocity
of light as 325940 km/s. We have to remember here that the
above value is an approximate one intended for easy
remembrance, like remembering the value of pi as 22/7. It
is better than the value 215000 km/s given by Danish
astronomer Ole Roemer in 1676. Having discovered so many
things, it is only logical to expect that our ancestors
must have used light as the standard for length
measurements; after all, modern science considers velocity
of light to be a Universal Constant!

The word "kramamaana" of the above Sloka has the hidden meaning of gradual minute change. Western books say
that velocity of light is a unversal constant. Einstein postulated
that light ray will bend when it passes near a very high mass
object. My questions is how can "that which bends" be taken
as an universal constant? The modern science is hardly
200 years old. Rishis of ancient India did research for
millenia and found that velocity of light gradually changes
(Kramamaana) over millions of years. It is known to many
that the Sun is losing mass over millions of years. It is but
natural to expect that the speed of light that emanates from
the Sun also goes through a proportional decrease.

In the ancient Sanskrit text named Anu
Sidhdhantam, Maharshi Goutama described three models of
micro-scopes through which atoms can be seen. When
the western world develops equipment having greater precision
than what they have at present, they will discover that
the velocity of light from newly born stars is faster than
that from our Sun.

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Answer 3

The velocity is differs in different mediums

velocity of light in air = 3*(10) 8 m/s

velocity of light in water=2.25*(10) 8 m/s

velocity of light in glass= 1.8*(10) 8 m/s

Answer 4

te velocity of light is 3*10^8 m?sec

Answer 5

In vaccum it is 3 X 10^8 m/s

Answer 6

3*10^8 m/s

Answer 7

This is nice style of asking question. Actually I'm not going to to answer this question by typing value of speed of light.

When I was going through last chapter of Concept Of Physics 2 By H. C. Verma, I lost my interest in science because Writer proved that any particle can not exceed speed of light.

And I want to check whether is there any other planet like ours or not.

Answer 8

Quantum of light is a privileged particle.
Only the speed of a light quantum has
a maximal, constant, absolute quantity of c=1.
No other particle can travel with the speed c = 1.
If quantum of light flies always rectilinearly c=1, it is a mad one.
Is he really mad?
* * *
The Soviet/Russian academic S. Vavilov suggested an
interesting idea. In his book 'Isaac Newton' he wrote.
The force, according to the Newton,s Second Law,
is equal to : F= ma.
This force is possible to consider as absolute independent
quantity - impulse. When in case with light quanta
the impulse is equal to: mc.
He continued.
Let us now imagine that light quanta falls on a black body,
and it absolutely absorbs this light quanta
( it means light quanta stops).
Then, according to the Lebedev,s law, light quanta
renders pressure on the black body: E/c.
Therefore it is possible to write: mc=E/c.
It means that according to Classic physics the stopping
light quanta has rest mass ( potential energy/mass):
M=E/c^2. (E=Mc^2).
=========================
The potential energy/mass of light quanta
can transform in its kinetic energy.
============
http://www.socratus.com

Answer 9

The velocity of light in vacuum is 299,792,458 metres per second.

Answer 10

velocity of light in vacuum is exactly 2.99792458x10^8 m/s.