Why is the speed of light constant? Doesn t it mean that things are relative? 5

The speed of light is not constant, the constant speed of light refers to the speed of light in a vacuum (3*10 8m s), it just represents the maximum speed of the movement of matter in reality. Only the speed of electromagnetic waves can approach the speed of light (light waves are a type of electromagnetic wave).

The speed at which light moves in different media is different, for example, the speed of light in water is only 3 4 ( in a vacuum.

From what I have learned, the constant speed of light in a vacuum is mainly confirmed by experiments. Famous experiments include the Michelson-Morey experiment. Almost all modern physical theories are based on Einstein's postulate theory of relativity with a maximum speed of light of 3*10 8m s.

The movement of things is relative, but the light is an exception! No matter how you move, the speed of light remains the same.

The propagation velocity of light in different substances is not certain, even in the same substance, the propagation velocity in different directions can be inconsistent.

In a vacuum where the propagation velocity in the air is approximated, we can determine the propagation velocity of light between matter from the change in the refraction angle of light passing through the interface of different substances, v1 v2=sin<2 sin<1

The higher the refractive index of a substance, the slower the speed at which light travels. Some minerals have two or three refractive indices in different directions, such as calcite, olivine, epidote, etc., which is also the basis for our identification of minerals.

We see that diamonds shine brightly, and they are produced by using the principle of its high refractive index to make the best cut.

The speed of light in different media varies significantly, but we usually speak of the speed of light in a vacuum (i.e., c). (Light is a type of electromagnetic wave, and discussing the change in the speed of light is equivalent to discussing waves.) ）

I also wondered, if the energy of light was lowered, would the speed of light drop?

People should not be too conceited, and the knowledge of predecessors is good, but wait for science to develop.

When we were able to verify his authenticity, we didn't know if the things of the predecessors were.

It's still unbreakable.

This is the difference between general relativity and special relativity.

The principle of invariance of the speed of light inevitably leads to (a

a. The concept of "simultaneous" is relative

b、"At the same time"Absolutely.

c. The speed of light is isotropic.

d. The speed of light is the ultimate velocity.

The principle of invariance of the speed of light is a hypothesis made by Einz Yuanyuantan based on Maxwell's electromagnetic equations and the results of the Mai-Mo experiment, as a principle of the theory of relativity.

The constant speed of light, the constant speed of light, and the constant speed of light relative to any frame of reference means that the speeds cannot be superimposed arbitrarily, not linearly like the Galilean transform (approximation of the low-speed state). Thought experiments that hypothesize that "throwing another object forward on an object moving close to the speed of light to reach the speed of light" do not hold water, and people are confused by the misconception that this is possible.

High-energy physics experiments have proven that it is not possible to bring microscopic particles to the speed of light, and at a certain speed, the particles are no longer able to accelerate, and it is said that the energy is converted into the mass of the particle, or radiation will occur if the energy is continued to be applied.

From the principle of invariance of the speed of light, the concept of "speed of light limit" is further deduced, and it is impossible for any object with static mass to reach the speed of light, and the speed of light is a limit speed. However, people often forget that this is the speed limit of "objects with static mass", and even assert that the speed of light is the maximum speed of mass, energy, and information transmission in the universe, and subjectively deny the existence of "imaginary mass" material forms and the existence of faster than the speed of light.

The speed of light can only be the limitation of the state of the particle, which does not exclude the existence of a diffuse, diastolic, non-localized form of matter in a virtual field state and the existence of the speed of light.

The principle of invariance of the speed of light, which states that velocities cannot be linearly superimposed like the "Galilean transformation" (an approximation of the low-speed state), means that the inertial frame of reference for uniform motion is not equal. The speed of light does not change due to the selection of a frame of reference, and the speed of light is no longer relative, but is an absolute speed, which strongly requires a superior frame of reference.

Logically, if all frames of reference are the same frame of reference – a superior frame of reference – it can also result in the speed of light not changing, and the speed of light will not change relative to this frame of reference.

All objects (particles) moving at different speeds are in the same superior frame of reference, and this extremely secretive and inconceivable superior frame of reference actually exists, that is, a superior frame of reference deduced from the complete quantization—the quantization of space-time and motion—the "leaping motion of variant particles".

The 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.

In the general theory of relativity, since the so-called inertial frame of reference no longer exists, Einstein introduced the principle of general relativity, that is, the form of the laws of physics is constant in all frames of reference. This also allows the principle of invariance of the speed of light to be applied to all reference frames.

The derivation process of the principle of invariance of the speed of light:

The fourth solution with the constant speed of light is the mass-speed solution, which is derived from the mass-speed relation. Einstein's mass-velocity relation:

m=m0 1- 2 c2 (m is the moving mass, m0 is the rest mass, is the speed of the object, c is the speed of light) Description: When the object moves at a speed much lower than the speed of light (at the human scale), the mass changes are not obvious, and the increased mass is negligible, and the mass can be considered unchanged, which can be used to meet the calculation needs with the laws of classical mechanics.

However, when moving close to the speed of light, the mass of the object increases more, and as it approaches the speed of light, the mass tends to infinity. The large and small poles are connected, and the mass is infinitely large because the two poles are the same and infinitely small, and the infinitesimal mass can be regarded as zero, so the photon has no rest mass. Light is the limiting object, the size is the same, the movement and static are also the same, and the absence of static mass is the absence of moving mass.

From the mass-velocity relation, it can also be obtained that when m0=0, m=0, =c, this formula is not valid.

Some people think that there can be energy without mass. It is important to know that the electromagnetic field is an energy field, and the light quantum is an energy particle, because the photon has no mass, any energy value is infinite when compared with the mass, because there is no mass, no energy is consumed in motion, except for transferring energy to other objects, the photon energy is enough to keep its speed constant.