What is the relative speed?

relative speed indicates the speed and direction of the object with respect to some other link. There is no standard reference for relative speed; However, some links, such as Earth, are much more comfortable than others. Thanks to this principle, it is possible to describe the same object as with more different speeds, each with a different reference framework. However, the speed of light is not a relative speed in this sense.

Usually all speeds must be relative to some reference framework. Any reference framework in space that does not accelerate is also suitable. Earth's surface is a good approximation for the reference frame when they are concerned are not too large. This is because small areas seem flat and stationary; This means that objects seem to be at rest when they move at the same speed as the Earth. When the distances become too large, there is no longer point in giving the Earth to the ground - the rotation of the Earth is pointing, different parts of the world move in different directions.

For example, it means that the speed of 70 miles (112.7 km) per hour on the highway is due to the "stationary" soil. This is because the surface of the earth rotates around the core and the earth travels around the sun. The solar system itself revolves around the center of the Milky Way galaxy, etc. The speed is therefore only useful when it is relative to a certain reference framework. The highway speed limit is in fact a relative speed limit.

Danish astronomer Ole Christensen Rømer first measured the speed of light in 1676. He compared the time when it took light to travel from Jupiter's moon Io when the Earth was at different distances from it. When the Earth was further from Jupiter, it took significantly longer than the light arrived. However, the unknown is not the same as a common matter. The speed of light and all electromagnetic radiation is constant no matter who observes it.

in 1905 was proposed by a German album physicistErt einstein theory that the movement of the observer does not affect the speed of light. This breakthrough served as a basis for the theory of special relativity. Its consequences, albeit during everyday life, are far -reaching in physics. In essence, the principle means that the speed of light is not a relative speed in the previous sense. The time itself is more dependent on the movement of the observer.