Time dilation - How gravity bends time?

Time dilation - How gravity bends time?

What is Absolute and relative time?

1)Newton's Absolute time

Believed that absolute time was an objective reality that flowed at a constant rate throughout the universe. He thought that absolute time was imperceptible and could only be understood mathematically

2)Einstein relative time

Believed that time was relative and depended on the observer's reference frame. He theorized that the rate at which time passes depends on: 

-The relative motion between observers 

-The strength of a gravitational or acceleration field 

-Where the observer is 

-How fast the observer is travelling

How time is measured?

Time is measured by the observation of repeating events. All clocks record time with some repeating event.

More sophisticated clocks use light beams bouncing between two mirrors as the repeating event to measure time. Each time the light bounces off the mirror, the clock ticks. 

What is time dilation?

Time dilation is the difference in elapsed time as measured by two clocks, due to -

1) Either, because of a relative velocity between them (special relativity), 

In the 1970s, scientists did an experiment on the effect of speed on time. They put atomic clocks on fast-moving planes and had them fly around the earth twice. When compared with the same atomic clocks sitting on earth, the clocks on the planes slowed down. In other words, not as much time had passed on the planes. Once again, time slows down when you're going really fast (close to the speed of light).

2)Or A difference in gravitational potential between their locations (general relativity)

The ultra-precise satellite clocks used in high-accuracy GPS need to be synchronized with clocks on Earth due to the effects of relativity that vary the rate of time.

Compiled by

Ms Naresh kuwar