Moving on to the silly question 0 about the speed of light

Imagine a stationary disk with a circumference to a diameter that is p. If the disk is spinning, its circumference will appear shorter to the resting observer than it would be when it is not moving, which is the phenomenon of space contraction in relativity. The faster the rotation of the circle, the greater the degree of shrinkage of the circumference, so that the tangential speed of the circumference is limited and does not exceed the speed of light.

In other words, a rotating disc will be deformed, the circumference to the diameter ratio will be smaller than p, and it will no longer be a flat disc at rest!

If it is 30,000 revolutions per second, the terminal linear speed must reach the radius of the speed of light, where does the centrifuge come from so big? The landlord wouldn't be deliberately hiding the unit to deceive people, right?

If it is the rotational speed, the radius of 10cm (the centrifuge is so big, right?) ), the peripheral linear speed is 6280m s.

Agree with the statement of the third floor. One less problem for the landlord"thousand"The speed of light is 300,000 kilometers per second.

Light has wave-particle duality, and no one has ever said that waves move in a circular motion, right?!As for the particles, do you think they can be explained from your point of view? When he moves from the beginning to the time he stops, without an eternal centripetal force, will he move in a circular motion?!

Do you think there's something about this photon as a centripetal force? Don't tell me it's gravity! In that case, you can talk to me about gravitational lensing!

It's not the same category as you get a centrifuge!

The speed of light is 300,000 kilometers per second, which is the approximate speed of light in the cosmic vacuum, if it is more than 290,000 if it is not 300,000 to be precise, but this is not absolute, the speed of light in water and atmosphere is different from the speed in the universe!

The speed of light is 300,000 kilometers per second! The landlord is missing a "thousand" word.

In addition, the answer to the space madhouse looks the same as the real thing, but in fact, the theory of old love is just a theory. There are no close experiments to prove it.

There is no contradiction in this. To be precise, we see only light, not the sun itself. Eight minutes ago, the actual position of the sun was overhead, and at that time we saw the sun's rays sixteen minutes ago, so at that time we felt that the sun was on the left-hand side; Eight minutes later, the actual position of the sun is on the right-hand side, but the light we see is the light that arrived just eight minutes ago, and it feels as if it is overhead.

The landlord's understanding is slightly off. Light has no inertia because inertia is produced by mass, light has no mass and hence has no inertia. In addition, light travels in a straight line in the absence of gravity.

Light is bent under gravity, because gravity is a manifestation of the curvature of space-time (relativity), and space-time curvature is the curve of light in space-time. However, the speed of light is the fastest that humans have detected so far, and this phenomenon that is "contrary to common sense" is not obvious. )

I always feel that the reason is that the solar system is too big, and the earth's rotation also has a direction, these two factors add up, the movement of the sun will not give us much displacement in eight minutes. If it's 80 minutes, the feeling is obvious, and the sun is really on the right hand side.

Haven't you learned the word referential?

Movement depends on the referent, the train is moving relative to the person on the platform, and stationary relative to the person doing the train.

In fact, the sun is stationary relative to the earth, relative to a certain point of the earth is moving, this movement comes from the rotation of the earth, the rotation of the earth causes the distance between you and the sun to change constantly, 8 minutes is too short, you can't feel it in terms of the distance of the earth and the speed of the earth's rotation on the sun island, for example, compare a mountain in the distance to the sun, you see the mountain in front of you, you move a step to the left, in fact, the angle between you and the mountain has changed, but you see the mountain is still in front of youThat's the truth.

The earth is also in the solar system, the earth and the sun are revolving around the center of the galaxy together, and the speed of the two is the same, so they remain relatively stationary.

The solar system in the Milky Way is doing a similar motion of the earth around the sun, but this movement does not affect our observation of the sun because they move together. What will affect our observation is the rotation of the earth, we stand at 120 degrees east longitude to observe the sun, the sky should be 12 o'clock, that is, we see the sun at 11:52 Beijing time, what about the sun at 12 o'clock? At 12 o'clock, the sun had just set off, and when we arrived at 1208, we saw it, and then the earth turned a little bit and the sun turned westward.

I don't want to talk about you.

From the perspective of the general environment, the orbit of the earth around the sun is determined, and the distance from the sun in what season is also basically determined, and then look at the rotation of the earth itself, one circle a day is still very long for eight minutes, and the sunlight is shooting towards the earth from all directions, so the feeling that people say to you is even smaller.

I'm going to answer this question, and if you think about it, you don't see the sun for the first eight minutes, because there's no light in your eyes, and in the eighth minute, you see the sun's light in the first second of zero, and you start to see the sun, and at eight minutes and one second, you see the light of the sun at one second, and you see the sun at one second, so the sun you see is also eight minutes later, but it's also a continuous sun (8 minutes to 8 minutes and 1 second, you see the sun in 0 seconds to 1 second), not that you see the sun at 8 minutes and 1 second There is a difference of 8 minutes of exercise time in the middle, and then let's talk about the relative movement problem, many netizens have said, you can see for yourself.

The Earth will move with the Sun ... There is only one revolution between the earth and the sun.

Vision is the speed of light, but this is only the speed of light, in fact, it is still 1 2 speed of light. Regardless of the inertial frame of reference, the propagation speed of light in a vacuum is a constant, c = source s, which is the principle of invariance of the speed of light. The speed of light is absolute speed, not relative speed.

In astronomical observations, the phenomenon of apparent superluminal speed often occurs, but these are not really superluminal speeds, but are just optical illusions.

The movement of an object close to the speed of light will produce the effects of "bell slowness" and "ruler contraction", the effect of "bell stopping" and "ruler elimination" will occur when moving at the speed of light, and the effect of "bell inversion" and "ruler expansion" will occur when moving faster than the speed of light.

We look at the man who moves at the speed of light and see that his time stops, and he sees our time stop. This is supposed to be a visual effect, a person is moving close to the speed of light, but to outsiders it seems that his time has slowed down and the scale has shortened, while for himself, there are no such changes.

Measurement of the speed of light, when the distance between two objects is known, a laser reflector is installed on one object, the laser beam is reflected on the other object, the time taken from the reflection to the time the laser beam returns to the place of reflection is recorded, and the distance between the two objects is known The recorded time 2 is the speed of light.

If a person flies infinitely close to the speed of light to a place with a distance of one light year, how much time does it take him to arrive.

I have a question about this because I think that when you get close to the speed of light, time passes very slowly, or even stops, so isn't it possible to get there? Because distance = time x velocity.

I'm actually trying to ask how much time it took to arrive when that person arrived with a timer.

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.

The definition value of the speed of light in vacuum: c0=299792458m s

The calculated value of the speed of light: c0 = (generally 300000km s).

The speed of light is not the fastest in the universe, there is already a precedent for faster than the speed of light.

The speed of light is really a super-super-fast unit of speed.

You have to believe that when we die, when the universe disappears, the universe comes from nothingness. The time that has elapsed in our universe is nothing more than a moment.

It is recommended to read "The Twin Paradox", Einstein has answers to such questions.

It is recommended to read the one-dimensional mathematical derivation of the special theory of relativity.

Pay attention to the mathematical understanding of relativity and the choice of space-time coordinate system, and pay attention to the concept of simultaneous measurement. These two questions are not raised in classical physics, and in the theory of relativity, it is necessary to establish a correct interrelationship.

The speed of light refers to the speed at which light waves or electromagnetic waves travel in a vacuum or medium. The speed of light in a vacuum is the maximum speed of motion of an object in nature that has been discovered so far.

It is independent of the speed of the observer relative to the light source, i.e. the speed of light measured in the inertial frame relative to the stationary and moving light source is the same. The mass of an object is also related to the speed at which it moves (provided that the speed of the object is quite large, which can be compared with the speed of light, for example, a quarter of the speed of light), the mass of the object will increase with the increase of speed, and when the speed of the object is close to the speed of light, its mass will tend to infinity, so it is impossible for an object with mass to reach the speed of light. Only photons with zero rest mass are always moving at the speed of light.

The time of light from the sun to the earth is 1 minute, and the time for people to reach the sun is 1 second, from here it is recognized that the speed is faster than the speed of light, according to Einstein's theory of relativity, the superluminal object can be space-time reversal space-time travel, this moment of time will be reversed, so if you infer it like this, you can still prevent **.

...If you ask how to calculate the value of the speed of light, it can be derived from the electrodynamic equations (McCelots).

There are many ways to actually measure it. Basically, there are two ideas: one is to find the wavelength frequency and then find the speed of light, and the other is to use large distances to directly divide time.

.The McCephalic equation doesn't use the time you understand the distance divided by time. The McFic equation was originally used to study electromagnetic fields.

It was later deduced that light waves were actually electromagnetic waves. What is in it is the partial conductance of the electromagnetic field to time. And what you say about our time is not the same thing.

Moreover, it makes little sense to describe "the time when the light is". There is no reference frame that is relatively light-stationary. When approaching the speed of light, the Lorentz transform can be used to derive the transformation relationship between different reference frames.

Not unknowable.

On the latter question, you could say that the special theory of relativity is based on the invariance of the speed of light. That's not very tight.

Now we're talking about the speed of light in a vacuumc c is talking about the speed of light and not about light, and even if light is slowed down by some influence, it doesn't affect the theory of relativity, and you may be wrong about the constant speed of light.

First of all, the speed of light has no relationship with the brightness or area of the light source. This is the principle of the invariance of the speed of light, which is in the textbook.

Regarding the end of light, human beings have limited ability or means to explore the universe, the speed of light is 300,000 kilometers per second, even if the size of the universe is measured by him, human beings only explore in an infinite sphere of hundreds of millions of light years, looking for information from outer space. No matter how far away humans are there to detect it. So, from the current point of view, there is no end to the light.

That is, the book of acacia pants makes it come to the end, reflecting back, that is also in 2 ...Billions of light-years later, when the solar system has long since died out and BenQ no longer exists.

A black hole can barely be said to be the end of a light, because it is impossible to escape the speed of light on the surface of the black hole, so it is impossible for a state black hole to be discovered with an optical telescope.

Speed has nothing to do with anything else.

What do you mean by the end?

In classical physics, you can say that the flashlight itself moves in the opposite direction at 400,000 kilometers per second, and the light is minus 100,000 kilometers per second, and it will never be seen.

But in the theory of relativity, there is an assumption that the speed of light in a vacuum is constant in any frame of reference, 300,000 kilometers per second. That is to say, if Xiao Ming stands on the ground and Xiao Hua stands on the moving car with a flashlight, no matter how fast the car is, the speed of light that Xiao Ming and Xiao Hua see is 300,000 kilometers per second. After that, a series of things can be deduced, such as no object can exceed the speed of light, objects with relative motion are different in time and space, classical physics is an approximation of relativity in very small cases, and so on.

You feel contradictory because you have a hypothesis in your own mind. If you feel that the earth is the center of the universe, as people used to do, then there is a contradiction in the trajectory of the celestial bodies, as Copernicus insisted; If you think that heavy objects fall quickly, like people in the past, then two objects, one heavy and one light, are tied together and fall, there is a contradiction, as Galileo discovered. If you think that the speeds of different frames of reference are simply addition and subtraction, as Newton did, then there is a contradiction in what a person can see at the speed of light, as Einstein discovered.

It's not that you're contradictory, it's that your assumptions are wrong. The addition and subtraction that can be seen between the velocities of different reference frames is only an approximation of the theory of relativity at speeds much less than the speed of light.