Sunday, October 2, 2022

what is the time?

Time is the apparent progression of events from the past to the future. While it is impossible to fully define the nature of time, we all share many common experiences tied to time: causes naturally lead to effects, we remember the past but not the future, and the evolution of time appears to be constant and unchanging.

Is time relative?

Einstein’s special theory relativity It turns out that the experience of the flow of time is relative to the observer and their position. Earlier, the work of Isaac Newton assumed the existence of a “master clock” that synchronized time throughout the universe. This clock did not actually exist, but the concept allowed Newton’s equations to work. The main idea was that all observers could agree on the exact same time, According to the Internet Encyclopedia of Philosophy (opens in new tab),

However, building on the work before him, Einstein It turns out that the passage of time is relative. In special relativity, moving clocks move slower; The faster you move through space, the more slowly you move through time. The closer you get to the speed of light, the greater this effect becomes.

Einstein's theory of special relativity shown with trains.  Mark Garlick/Science Photo Library via Getty Images

Einstein showed in his theory of special relativity that two observers cannot agree on events occurring simultaneously. It can be understood from this diagram. To the left, a train carriage is shown with a man, Alice, inside. Alice turns on a light in the middle of the car and observes the beams of light arriving at both ends of the vehicle at the same time, T2. On the right we see the view from Bob’s point of view on the platform as the train moves with a velocity v. He, like Alice, sees two beams of light being emitted at the same time. However, because the train is moving to the right, the rear of the train first turns on the left side light at T1. Does it on T1. So from Bob’s point of view, the events Alice saw together happen one after the other. (Image credit: Mark Garlick/Science Photo Library via Getty Images)

In the decades since Einstein first proposed the concept, physicists have made a number of measurements that demonstrate this effect. An atomic clock on a jet airplane will tick slower than one on the ground. A subatomic particle called a muon does not exist long enough to travel through the atmosphere, where it is produced when cosmic rays Strike the air molecules on the ground. But since muons travel at close to the speed of light, they exist longer than our point of view, allowing them to complete their journey.

Nation World News Desk
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