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The speed of light (c) in a vacuum, is exactly299,792,458 meters per second (ms-1), which rounds up very nicely to 300,000,000 ms-1, which scientists write as 3 x 108 ms-1.

In more dense media the speed is slower,

e.g. # Air, only slightly less than c, speed is 0.9997 of c. # water 0.75 of c. # fused quartz 0.686 of c. # crown glass* 0.658 of c. # dense flint glass* 0.60 of c. # diamond, approx 0.41 of c. CALCULATIONS The speed of light, using a very close approximation for calculation purposes, is taken as 3.0 x 108 m/s (metres per second). i.e. 300,000,000 m/s The greater the refractive index of the medium, the slower the speed of light in that medium/material. The speed of light in a vacuum [c] divided by the velocity of light in the material [v] equals the refractive index [n] of the material. Examples 1. calculate the refractive index of space: c/c equals 1 2. water (the speed of light in water is 225,056,264 m/s): c/ 225056264 equals 1.333 Inversely, if we know the refractive index of a material, we can calculate the velocity of light through that material, i.e. the speed of light [c] divided by the refractive index [n] equals the velocity of light [v] in that material Using the example of water, refractive index 1.333 :- 300,000,000 [c] divided by 1.333 [n] equals 225,056,264 [n] i.e. the velocity of light in water is 225,056,264 m/s. This is 225,056,264/300,000,000 ths the speed of light, or 0.75 of c. SOME REFRACTIVE INDICES * vacuum1.00 * air 1.0003 * water 1.333 * fused quartz 1.4585 * plexiglass 1.51 * crown glass* 1.52 * diamond 2.417 * gallium phosphide 3.50 *Crown glass is a type of glass used in lenses, and has a lower refractive index than flint glass which is also used in lenses. For more information, see Related Links below this box

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โˆ™ 2015-12-28 07:30:17
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Q: What is the velocity of light in space and in different materials?
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Related questions

What color has the maximum velocity?

In empty space, light of different colors moves at the same speed - about 300,000 km/sec.


Why is light important to learning about space?

Light is a measurable medium which passes through space. It can further be broken into different components and they can be used to calculate distance, velocity, frequencies etc. It can be used to determine size of planets, galaxies and their distance from us.


Which of these is constant for types of electromagnetic radiation in a vacuum?

Answer = Velocity Velocity is the speed of light and, the speed of light, is a constant among Electromagnetic Radiation in the vacuum of space.


What is the velocity of sound in space?

Sound requires the physical compression and expansion of molecules to be transmitted, it is not electromagnetic energy like light and microwaves. It therefore cannot be transmitted through a vacuum so it cannot have a velocity in space


What materials can light travel through faster than it travels through air?

Light travels fastest through space which has no air. Space is a vacuum which is the fastest way for light to travel.


What is the velocity of light in space compared to that in a denser medium?

The speed of light and all other electromagnetic wavelengths in vacuum (empty space) is higher than in any other medium.


What the different between velocity and speed?

velocity is measured in relation to a certain spot on earth or a space, whether its moving or not. Speed is measured in relation to the earth.


What properties of space determine the velocity of light?

The velocity of light and all electromagnetic radiation is determined by two properties of space. One is the electrical property which is permittivity and the other is the magnetic property which is permeability. Their values were determined more than 150 years ago by the great scientist Jame Clerk Maxwell. They are not constant in value, but vary based on the material in which they are located. In most cases they diminish the velocity, but in a few they increase it. If the value of either or both of these properties can be modified, then the velocity of light can also be modified.


Does liquid take up space?

Yes all materials occupy space. Any liquid is no different and also does.


What is the velocity of a radio wave in free space?

299,792,458 ms-1 also known as c / speed of light.


In vacuum the velocity of light depends on?

The electrical characteristics of free space, and the direction the source is pointing.


Why do we need to study light?

Light is a kind of energy which is sensed by eyes. Light is found to be electromagnetic wave whose velocity through space is decided by the magnetic and electric properties such magnetic permeability and electric permittivity. But the beauty is that the very space is relative.


How are the Distances between different objects in space measured?

they use light-years to determine the space between objects in space


What can light travel through?

Light travels through two things: either empty space, or space which contains transparent materials. Some paterials are only partially transparent or translucent, in which case some light does travel through it, but not all the light will get through.


What is the space velocity and space time in tubular flow reactor?

Space velocity is the number of reactors treated in unit time while space time is the time required to treat a reactor.


Velocity of light in free space in feet per sec?

Velocity of light in free space = 299,792,458. meters per second (rounded). 1 meter = 3.28084 ft (rounded) 299,792,458 meters per second = (299,792,458 x 3.28084) =983,571,087.9 ft per sec (rounded)


What kind of waves are light waves?

Light waves can pass through even vacuum . They traverse electromagnetic waves. Velocity of light in free space is 3 x 10^8 m/s.


How does spacestation remain in space?

In space, constant velocity equals constant movement, so if something doesn't have velocity it stays in place.


What is the velocity a rocket needs to reeach to orbit in space called?

Escape velocity.


What explains why a prism separate white light into the colors of the rainbow?

Different colours travel at different velocity in a glass medium. Refractive index is defined as the ratio of the velocity of light in free space to that in medium. So refractive index becomes different for different colours. Now by Snell's law the refractive index is inversely proportional to the angle of refraction. Hence different colours get deviated at different angle of refraction. So the splitting of composite white light into its constituent colours has become possible. If these again fall at a parallel surface as in the case of a glass slab the colours split would get combined back and emerge as white light. But we have prism where the two refracting surfaces are at inclined and further splitting takes place and hence dispersion.


How would you use transparent translucent and opaque materials to design a living environment?

Translucent or opaque materials imply less light penetrating capability or distorted ( as opposed to clear) view through material. Therefore these tupe of materials is used to cast a soft light glow into a space, so therefore one would use these materials to filter or cast a reduced light for the purpose of giving a space a less light than required, a soft glow or tinted light outlook as a result. The reverse is perhaps the view through the medium is not really the best outlook - so placing an opaque medium between still gives you light for the space but not clear view of the outlook beyond.


Does light take time to travel through space?

The velocity of light in vacuum is 299,792,458km/s, for daily calculation it's considered as 300000km/s, so put the distance and "C"(velocity of light) in speed and distance equation and you will get the answer.[time=distance/speed]"atul ashish"


What the material through which light travels?

Light travels though a medium called "space-time" and can also travel through transparent and translucent physical materials.


What are some experiments that are done on the space station?

Many different experiments are done on the space station. There have been experiments done on Salmonella; Tethered Satellite System; seeing if a rose smelled different in space; building protein crystals; building films or materials in space; and studying nematodes in space.


Can an object have momentum in space?

Yes. Momentum is based entirely upon mass and velocity, as shown by the equation p=mv, where p is momentum, m is mass, and v is velocity. Since an object can still have both mass and velocity in space, it can have momentum in space.