Solve why does the speed of light not change? 20

Light is an electromagnetic wave, and the speed of propagation in a homogeneous medium does not change. But the speed of light changes, as it travels from one meon to another. Not changing means that in a homogeneous medium, no matter what speed you look at it, it will not change.

Since the photon has no rest mass when the speed of light does not change, which is probably why, it is impossible for anything with a rest mass to exceed the speed of light. The Michelson experiment mentioned upstairs verifies not that the speed of light does not change, but that the aether does not exist. If you really want to figure it out, it's best to look at books like field theory, which are generally not understood, and the questions asked are very superficial (including mine), and I can't think of specific things at the moment, there are only so many things I can think of, I hope to help you.

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Principle of invariance of the speed of light: The speed of light in a vacuum is the same for any observer. The principle of invariance of the speed of light, in the special theory of relativity, refers to the fact that the propagation speed of light in a vacuum is a constant regardless of the inertial frame (inertial frame of reference) in which it is observed, and does not change with the relative motion of the light source and the frame of reference in which the observer is located.

This value is 299,792,458 meter seconds.

The principle of invariance of the speed of light was obtained by solving Maxwell's equations simultaneously and confirmed by the Michelson-Morey experiment. The principle of invariance of the speed of light is one of the basic starting points for Einstein's creation of the special theory of relativity.

The speed of sound propagates at different speeds in different media, because sound is produced by the vibration of external matter, and sound cannot be produced in a vacuum, so the speed of sound is affected by the medium, but what is light? Photon? Light is not dependent on external conditions, as long as there is a light source.

If you can say why, you're better than Albert Einstein.

The constant speed of light is not difficult to understand, we often say that the speed of light does not mean that "the speed of light in a vacuum is 300,000 kilometers per second", but in any frame of reference, the speed of light in a vacuum is 300,000 kilometers per second! This is contrary to Newton's classical mechanics, because Newtonian mechanics emphasizes that any speed is relative, and different frames of reference make velocities different, but the speed of light is not!

So why does the speed of light have to stay the same?

The fact is that no one wants the speed of light to be constant, it's just a hypothesis set by Einstein in order to reconcile the contradictions between Newton's classical mechanics and Maxwell's equations, yes, an Einstein hypothesis!

Newtonian classical mechanics shows that velocity is relative, while Maxwell's equations imply that the speed of light can be constant in any case without a reference frame. After that, the physics community forced the concept of aether to think that the speed of light is relative to the speed of aether, but then we all know that aether proved to be non-existent!

And Einstein's greatness and wisdom began with his keen and unique way of thinking: why does speed have to be relative? If the speed of light is absolute (i.e., the speed of light is constant), Newtonian mechanics and Maxwell's equations are perfectly solved!

As a result, Einstein boldly hypothesized the principle that the speed of light does not change. In principle, this principle cannot be proved, it can only be "falsified", that is to say, as long as scientists find that there is a situation where the speed of light is changing in many phenomena, it means that "the speed of light does not change" is wrong, but scientists have not found it!

So, you can also take Einstein's "speed of light does not change" hypothesis as an axiom.

What axiom? It is a self-evident basic fact, a basic proposition that does not need to be proved, and is the starting point from which other propositions can be deduced, but not by other axioms!

For example, "the shortest straight line between two points" is the simplest axiom, we don't need to prove its authenticity, we don't need to prove it, if you have to ask why, it's very simple, you throw a bone in the distance, and the dog will chase it along the straight line! Dogs know the facts you don't know yet? Also use proof!

That's the axiom!

Einstein's "constant speed of light" has been proven by many experiments so far, but theoretically this does not mean that it is necessarily correct, because scientists cannot prove that all phenomena can reflect "the constant speed of light".

But this is the property of the axioms, and there is no need to prove it, unless you can find a better way to reconcile the contradictions between Newton's classical mechanics and Maxwell's equations than "the speed of light is invariant", then accept "the speed of light is not invariant". And the principle of the invariance of the speed of light is so simple, and what science needs is something simple, not a complex concept!

The constant speed of light is actually a hypothesis, and everyone has not fully understood it. When you have a gravitational vortex, the light travels a little slower.

The principle of invariance of the speed of light, in the special theory of relativity, refers to the fact that the propagation speed of light in a vacuum is a constant regardless of the inertial frame of reference in which it is observed, and does not change with the relative motion of the light source and the observer's frame of reference. This value is 299,792,458 meter seconds.

Proof

The principle of invariance of the speed of light: the speed of light propagation in a vacuum is a constant, which is measured in kilometers and seconds, regardless of the inertial frame (inertial frame of reference) in which it is observed. Four facts that prove that the speed of light does not change.

The fact that the optical travel difference of any stellar remains constant for a long time proves that the light travel difference does not change with time, so the speed of light does not change with time. The light travel difference of all stars is angular distance, proving:

All stars have the same speed of light. "The speed of light does not change" has been demonstrated in detail in "Systematic Analysis of Stellar Light Difference", so it will not be repeated.

Stars with the speed of light are all small dots one by one, which proves that all the rays of any star have the same speed of light, that is, there are no rays of different speeds of light. Since there is no 'change' in the speed of light, there is only a 'counter-proof method'.

Suppose that a star emits light at two speeds of light; Light at the speed of light c, denoted by c; Light at the speed of light c, denoted by c; The speed of light c>c Because c and c are continuous, the observer is able to receive both c and c; But C and C, which the observer receives at the same time, are not necessarily emitted from the star at the same time. Therefore suppose:

c is issued at zero moment; c is issued at the time t; The position of the sidereal zero hour is a; The position at time t is b; Since the apparent angular velocity of the star on Sunday = seconds, the angular distance between a and b = t is set again: =10 (1 3 of the diameter of the sun); The sidereal distance is l=30 light-years. Then:

t= 10 60 seconds) c propagation time t1 = l c = 30 (years) 86400 365 = 946080000 (s) c propagation time t2 = l c according to the title: t2 = t1 + t = l c + t = 946080000 + 40 = 946080040 (s) so: c = l t2 = 946080000c 946080040 km sec) i.e.:

If =10, then c-c = km/s) = 13 (m-s) That is, if the difference in the speed of light between the two rays is 13 m-s, then the star at a distance of 30 light-years is at the same time at an angular distance of 10 at a and b. The speed of light is much more likely to change continuously than intermittently, and if the speed of light of a star varies continuously in the range of c and c, it would seem, that star should be:

A line segment with a length of 10 angular spacing. Because it has never been seen: the star has multiple positions and any elongation, so the conclusion is correct.

Stars are stationary, proving that the speed of light of all stars does not change with time and is always constant c. This is because if the speed of light keeps changing, it looks like the star must be in motion. The proof method is similar to the above and will not be repeated.

Sunlight Michelson-Morey experiments prove that the speed of light in sunlight does not change.

1. The so-called "constant speed of light" means that the speed of light in a vacuum is constant for any frame of reference.

2. The reason for this statement is that the superposition principle of velocity in Newton's era tells us that if the speed of a train is v1 and the speed of the people on the train is v2, then the speed of people relative to the ground is v=v1+v2. So it was proposed that if a beam of light was shot at a flying rocket, then the speed of the light could exceed the speed of light.

3. However, after Einstein considered the relativity of time and space, according to the Lorenz transform, he deduced the superposition formula of velocity under the theory of relativity as: v=(v1+v2) (1+v1v2 c 2), through the above equation, it can be seen that no matter what speed the reference frame moves at (of course, the speed of the reference frame cannot be greater than the speed of light, which violates the theory of relativity), the speed of light is still c, unchanged. Suppose the velocity of the rocket is times the speed of light (i.e., the velocity of the beam emitted by the rocket is c, and substituting the above equation, the velocity of the beam after the velocity is superimposed is still c.

That's why the speed of light doesn't change.

4. The change in the speed of light in the air, in the water, and in the glass you mentioned involves another problem. Light is fastest in a vacuum, why does it slow down in a medium? Because light is an electromagnetic wave, it is composed of an electric field and a magnetic field that oscillate against each other, and the electromagnetic wave is the fastest in a vacuum without any influence.

However, when the electromagnetic wave is in the medium, it is affected by the dielectric constant and magnetic permeability of the medium, and the oscillation frequency of the electric field and magnetic field will change, so the speed of light will change accordingly.

The formula for the propagation velocity of electromagnetic waves in a medium is v=1 (

Originally, the speed of light was more than that, because of several cosmic-level dimensionality reduction strikes, I ran first.

The constant speed of light means that the speed of light in a vacuum does not change with the relative motion of the light source and the observer's frame of reference, not that the speed of light does not change in different media.

Turn right to physics....I wonder why this kind of water sticker is not sealed forever.

My understanding of the constant speed of light is: first of all, the speed I understand is calculated based on the amount of distance traveled per unit of time, and the constant speed of light means that the distance traveled by the speed of light is the same per unit of time, for example, a spaceship traveling east at a speed of 30m s has a beam of light shooting out towards the east, and the person next to it will see that the speed of light is still moving at the speed of light, and the speed of 30m s will not be increased, and in the same way, if the speed of light is westward, it will not be affected by the spacecraft.

Even, let's assume that the speed of light is 3m s, if a ship is moving east at a speed of 2m s, and a beam of light is emitted from the ship to the east, and there is a person at 3m in this direction of the ship, since the speed of light is constant, if there is an observer next to it, it will be found that after 3 seconds, the light will hit the person, it is not difficult to understand, 3-2=1.

But for this person, since the speed of light is constant, 3m s, and this person is only 3m away from the light source, then he only needs 1 second to see the light.

The 3 seconds for the observer is only 1 second for the person, and the time has become shorter.

For time and space, first of all, the speed of light is constant. That's how I understand it ... It may be wrong, if there is a mistake I hope someone can help correct it, thank you.