Why the speed of light changes when it goes from one medium to another medium?

We know, magnetic field=permeability/4π)Idlsin(theta)/r^2=>B changes according to permeabilityElectric field=1/permitivity*4π)*q/r^2E changes according to permitivitySince different medium have different permitivity and permeability v=E/B velocity of light changes in various mediums.

What's the property of light that doesn't change when it travels from one medium to another medium?

Hmmm... I might get balled out for this, but.....The 4 ‘properties' of ‘light' (photons), are . . . .Velocity, Amplitude, Frequency and Wavelength . SO....‘Velocity' can/does change, through different ‘mediums', whichdepends on the ‘mediums' refractive index.‘Amplitude' can change, relative to attenuation due to the degreeof transparency of the ‘medium'.During ‘transmission'

How many times would I go around the Earth in a year at the speed of light?

7.5 times a second, times 60 seconds a minute, times 60 minutes an hour, times 24 hours a day, times 365,25 days a year.236 682 000 times.

Would a spaceship traveling the speed of light look like a beam of light?

Nothing with mass can ever travel at the speed of light but a spaceship can travel very close to it 0.999c is perfectly possible. At 0.999c, no it will not look like a beam, it will look like a flattened spaceship. Its width and height will be normal but its length will be shrinked over 22 times.

What would happen if a black hole traveled faster than the speed of light?

The speed of light is the limit and the very first thing Wrong With Contemporary Black Holes. Quantum Relativity argues a case for quantum black holes that strongly interact. You still have a singularity defined by the Schwarzschild, but the Reimannian

How much time will pass on Earth if I travel one year in space with speed of light and return?

Two years.This is the answer if the question you ask is:If I travel at light speed away from the Earth while a year passes on Earth, and again at light speed back towards Earth while a year passes on Earth, how much time will

How viable is the idea of designing a spaceship for global faster-than-light travel by manipulating local space around the spaceship to make distance traveled locally shorter?

This is Alcubierre's idea, and it doesn't work, because there is an energy condition on matter which cannot be realistically violated which guarantees that you can't outrun light locally. It is the same condition that makes it that black holes

What is faster, the speed of light or the speed of darkness?

The speed of dark was proven to be greater than the speed of light by the troll mathematical physicist Big Al Onestone.His Theory of Special, General and Totally Indiscriminate Relativism states that if the speed of light were 600mph, the speed of dark would be at least 601mph. Otherwise, it wouldn't be able to get

Why would it be impossible to travel at the speed of light through a vacuum, I mean, it's not like there is any friction stopping the craft, so why would infinite fuel be needed?

Because the answer is.....drum roll please... the universe is way it is...Thats the answer. Friction isnt the cause of your blockade to speed of light. It is the universe itself. Or i should say space-time fabric itself.Our existence is defined according to our interaction with space ans time. At rest we dont travel through space but we travel

What is the maximum speed we can travel in vacuum?

Easy: 299,792,458m/s - the speed of light.In a vacuum, the only thing stopping you from going faster is the amount of fuel you can carry! Of course - when you get close to the speed of light, relativity kicks in - and you cant

Can this come close to the speed of light?

If that is what you wish to do, why are you stacking up 1 million escalators ?After all, the topmost escalator moves at 10^9 Km/h and the machine that is running this escalator will supply the whole power i.e. F*10^9 Watts. So first of all, there is no use of stacking up the

Will a vacuum affect how the speed of light travels?

Light can change speed, even in a vacuum, a new paper reports. The discovery could change the way we think about one of the constants of the universe.

Why does light bend around heavy objects?

GRAVITY!Every thing attracts other things in universe. Even it is mass or energy. Light is made up of subatomic particles called photons. Check my post for reason of your answer.Post by Moksha Kumar on The mysterious universe

Is it possible that light also bends space time fabric like gravity?

This question itself is questionable. Space-Time Continuum is being debated since the era of Einstein & Poincare and even presently it is an enigma. In May, this year, the fifth conference on the Nature and Ontology of STC was organized in Albena, BULGARIA and the theme was Nature of STC - real or imaginary?

What is the fundamental reason of the speed of light being constant in all frames of reference?

The most simple answer to this might not be very satisfactory, but as I see it this is one of these question with the answer

What does light look like if you could travel almost as fast as light?

The theory of special relativity teaches us that no matter how fast you think you are going, you will always measure the speed of light to be roughly 3 /times 10^8 m/s. In other words, you can never gain speed on a photon. This weirdness is part and parcel of special relativity. The difficulties in conceptualizing

How can negetive energy be used to warp spacetime? How it can be used for warp drive propulsion (for traveling faster then speed of light) ?

Okay, so energy, right? Equivalent to mass times the speed of light squared. Point is that mass and energy are equivalent. That's positive energy. Positive energy behaves like positive mass, forming a gravity well whose strength is equivalent to the

Does the speed of a photon equal c or 0 when observed by another photon moving on a parallel trajectory?

Much of what we have today in the form of viable, testable, reliable theories of various aspects of physical reality began as a thought experiment. The notion that a photon has a point of view, or can

How slowly can light travel?

Humans have managed to slow light down to 38 mph for a few seconds. Before you say that messes with relativity it does not because the light was not in a vacuum. The speed of light is only constant in a vacuum. Physicists Slow Speed of Light Some people have

Does light have momentum because an individual photon of light has mass?

Yes, per MC Physics theory. A real photon, not a mathematical version, has real static and dynamic mass that gives it momentum and kinetic energy. That puts real photons on the same basis, following the same Universal rules and laws as all other matter in the Universe.More on real

Is thought faster than light?

It is sometimes objected that "they said no-one would ever go faster than sound and they were wrong. Now they say no-one will ever go faster than light. . ." Actually it is probably not true that anybody said it was impossible to go faster than sound. It was known

If air is moving fast enough, could it bend light?

Not in the way you're thinking. But, if air moves faster it will heat up. When it heats up it will change density. A lower density will have a different refractive index. So it will change how the light passes through it.

Which is correct, "When passing through air, green light travels faster than violet light" or "When passing through glass, red light travels slower than violet light"?

Neither.Light travels at the same speed - approx. 3 x (10 to the power of 8) meters per second, irrespective of the frequency. In fact, the Speed of Light ‘C' is the constant of proportion in the relation between Frequency and Wavelength - which are inversely proportional to each other.[math]Wavelength =

Did the early universe expand faster than the speed of light? If nothing can travel faster than the speed of light, is it possible that the speed of light was much faster than it is today?

Expansion rate is not measured in [m/s], but in [1/s], so you cannot compare expansion rate to speed of light/anything. It's like comparing kilograms and seconds.Two points at rest that are a distance D apart will see that distance grow in an expanding universe. D will increase in [m/s]

If flat earthers are correct and the earth accelerates upwards at 9.8m/s wouldn't all objects 'fall' at the same speed since the earth is moving not the objects?

I like Ed Smiley's answer... it at least tries to answer a queer question with a scientific proof of the incorrectness of its premises.There are abundant possibilities of proofing that Earth is not flat. Going o a mountaintop and looking around (good sighting

Why does light have no mass?

The question should be, why doesn't everybody understand what mass is. Mass is not a physical thing, it is a property of things. Not only does matter have mass, but so do units such as potential, resistance, magnetic flux, and angular momentum.The next problem with this question is that light

Does anything other than gravity bend light?

The fact that gravity forces can and do alter the vector of photons of light/radiation is significant, since that only happens with particles with mass, meaning it is matter. Therefore elemental photon particles have mass just like all the other particles and matter in the Universe, which also fits ALL the other properties of photon particles.

While travelling near the speed of light and I shine a light forward, what speed is that light travelling?

OK, first if you are traveling at the speed of light, you ARE a photon, so you ARE your own flashlight, and yes, your light (yourself) will travel forward at c.Here's the cool equation: consider you're on a ship moving at velocity u (relative to an observer),

If light did not travel in a straight line, how would it affect our vision?

Light is dual in nature, a wave or/and particle. So this affects the way light travels. To keep my answer short, here are few examples where light rays donot travel straight:Scattering phenomenon: Light rays from the sun are scattered before it enters the eye because of which the ray

If a light source is travelling at the speed of light, does it emit light?

The answer to your question is a simple yes it does. An observer will observe the emitted light and would MEASURE its speed as

If nothing is impossible, can we move faster than light?

We know that the statement "nothing is impossible" is false.It is impossible to know both the position and momentum of a particle within a certain limit. If you precisely know the momentum of a particle it is impossible to know the position of the particle within

How long would it take to travel across the Milky Way at the speed of light?

It depends on who you're asking.If you want an answer to this, you typically start out with a Minowsky Diagram. It's relatively easy to construct-two perpendicular lines with the vertical labelled ct for timexlightspeed and horizontal labelled x, like in a graph, and you're almost done. For convenience's  sake we'll measure distance, x, in light seconds-

Does lightning go as fast as light or sound?

Lightning is rather a sequence and a series of events rather than a single thing. It is light and sound. Each travels through a different medium and at different speeds. The lightning has a cause for creation, and another cause for the path of discharge, and yet another for the humongous discharge.The electric fields are first created

How do we know we are not travelling close to light speed in relative to something outside the observable universe and therefore to us, the aliens can observe but never reach us?

A simple answer to a difficult question.We are already moving very close to the speed of light relative to things very very far away.The observeable universe has a 15 billion light year radius with us at the centte.Everywhere in the universe is

If the universe is expanding with a speed equal to double of speed of light, cant we say that we are traveling faster than speed of light?

The question assumes a rather precise rate of expansion: twice the speed of light. But c is a speed (meters per second) whereas space doesnt expand at a speed. Space expands a certain amount of distance PER distance PER unit of time. A car goes

A bulb is traveling at the speed of light and it is glowing. Will the light ray going forward go twice the speed of light?

Light ray can not travel faster than its own speed because we can't give the inertia to the light and the rest mass of photon is also zero. It is the reason due to which light can't be move faster than its own speed

How will time be affected if someone travels at a speed exceeding the speed of light?

It is not possible in both theoretical and practical physics that govern this universe. Because to travel the speed of light only we require infinite amount of energy which is not possible and anything with mass it is not possible. At the speed of

How far does light travel in 1 second?

The speed of light is one foot per nanosecond. Therefore, in one second, light travels one billion feet!

Is it possible to increase or decrease the speed of light?

In my opinions, all photons are surfing/carried on a kind of wave. (Sourced from expansion of universe) Speed of these waves are "C". These waves are affected from energy density of crossed environment. Ie, intense magnetic or gravity waves

What makes it possible to see light?

You have eyes is the obvious answer. Eyes are special organs evolved to turn photons into nerve impluses, which your brain can then interpret as

What object can move at the speed of light?

An alternative view; Entire space, outside basic 3D matter-particles, is filled with an all-encompassing universal medium, structured by quanta of matter. Universal medium creates, sustains and moves the most basic 3D matter-particles, the corpuscles of radiation - the photons. Photons are moved by universal medium at the highest possible (hence critical constant) linear speed, the speed of

Why does light stop moving or just stops illuminating objects at a point?

A photon stops when it is absorbed by an electron in the material that it encounters. The electron is put temporarily into a higher-energy state (the usual term is "it is excited") by this. Later it will re-emit the energy: either as another

Is it possible to measure the speed of gravity?

Yes.  Three years ago as an undergrad I worked with LIGO, the Laser Interferometer Gravitational Observatory, to see how accurately we could measure the speed of a gravitational wave (the speed of gravity) if we had a detection of a continuous gravitational wave from a known pulsar. We haven't gotten a detection yet, but if we do,

Why do we see lightning as light?

When you walk across the carpet and touch a door know you generate a little spark. A lightning bolt is just a much bigger spark. The spark , or discharge of electrons emit frequencies through out the entire EM (electro magnetic) spectrum. That includes visible light, There

Could the matter on the surface of a fast spinning star travel faster than light?

No. There is a universal space-time constant that happens to equate to the velocity of a massless object in space: c. To approach any velocity, objects having mass need to be accelerated using mass as a propulsive; an object having

What is the light of light?

The light you are talking about is light only to us, this is different for different creatures. Some sense UV rays, some sense infrared rays-based on their habitat and evolution. What you are asking is what is light TO light, well I guess that doesn't make sense because LIGHT IS