Planck Time
The Planck time is the natural unit of time, denoted by tP. It is considered the smallest possible measurement of time.
<math>t_P = \sqrt{\frac{\hbar G}{c^5}} \approx<math> 5.391 × 10-44 seconds
where:
<math>\hbar<math> is Dirac's constant
G is the gravitational constant
c is the speed of light in a vacuum
The Planck time is the time it would take a photon travelling at the speed of light to cross a distance equal to the Planck length. This is the "quantum of time", the smallest measurement of time that has any meaning, (roughly 10-43 seconds). Within the framework of the laws of physics as we understand them today, we can neither measure nor discern any difference between the universe at the time it first came into existence and the universe anything less than 1 Planck time later.
The estimated age of the Universe (4 × 1017 s) is 7 × 1060 Planck times.
A Simple Definition
Planck's Time is how long it takes for light to travel Planck's length.
To understand Planck Time background knowledge is needed
Background
Planck Length is the smallest amount of length with significance as below this length Quantum laws reign meaning all measurements are nonsense.
Secondly, the speed of an object is caged be the Einstein's laws of relativity which states that nothing can travel faster than the speed of light.
How this relates to Planck Time
If we insert Planck Length and Speed of Light into the following well know equation
<math>\frac{D}{S}=T<math>
D = Distance
S = Speed
T = Time
We would receive the smallest possible amount of time - namely Planck Time
So this would mean that Planck Time is equal to
- 1.6 × 10-35 m / (299,792,458 m/s) <math>\approx<math> 5.391 × 10-44 seconds
External link
See also
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