Question

explain the meaning of time dilation and establish the expression for it

Answer 1

Time dilation is a physics concept about changes in the passage of time, as related to relativity. It is a difference of elapsed timebetween two events as measured by observers. ... Case #1: In special relativity, clocks that are moving run slower according to a stationary observer's cloc

Answer 2

According to the theory of relativity, time dilation is a difference in the elapsed time measured by two observers, either due to a velocity difference relative to each other, or by being differently situated relative to a gravitational field.