2015年9月9日 · What is the Planck Length? Planck units are defined based on physical constants rather than human-scale phenomena. So while the second is originally one-86400th of a day, the Planck time is based on the speed of light, Newton’s gravitational constant, and Planck’s (reduced) constant, which is twice the angular momentum of an electron.

hbar tells you the Energy/momentum time/position uncertainty, so that the radius at which a black hole's compton wavelength is comparable to its size is the Planck length. This is the smallest distance you can probe, since a particle of Planck energy is required to probe the Planck length, and it will produce a black hole of size the Planck length.

In the same way, when you say Planck length is the smallest possible distance ever, does that mean every particle( or it's constituents) jumps from one point to another where distance between the points is Planck's length, kinda like strip lighting, where bulbs lit in a sequence give the illusion that the glowing section is moving along the strip?

2008年1月14日 · The Planck time is the time it takes for a particle traveling at c to cross the Planck length. Also, dimensional analysis shows that the Planck length is the only length that can be obtained from some mix of the 3 important physical constants G, h, c (up to a scale factor), so this shows that it might (must?) have some physical importance.

2011年9月1日 · The time is called Planck time and represents the age of the universe before which the laws of physics as presently understood cannot be applied. Using the formula for the Planck time derived in part (a), what is the time in seconds?

2014年12月3日 · "Transplankian surface" would just be the place where, as you work your way back in time, using the expanding universe model that they use, the ENERGY DENSITY gets above some critical value, like the Planck unit of energy density. Or half the Planck energy density. Something like that. That energy density is amazingly high.

2003年9月21日 · One way to approach this question is to ask what has traditionally usually been meant by "Planck time" Planck proposed a set of natural units in 1899 to a meeting of the Prussian Academy and the time unit he proposed was for practical purposes the same as what is called "Planck time" today----about 0.539 E-43 second. For over 100 years the ...

2016年8月23日 · The Planck era is defined as the time when the universe was the size of the Planck length, $10^{-33}$ cms, and less, and the universe's age was $10^{-43}$ sec, the Planck time, and less. It is the earliest epoch we identify after the Big Bang. The Planck temperature at the end of the epoch was about $10^{32}$ degrees Kelvin.

2017年5月23日 · Planck time - the amount of time it would take a photon (or other particle travelling at the speed of light) to cross a planck length - the fastest known speed travelling over the shortest known distance. Time, as distance divided by speed, doesn't get much smaller than that. It is about 5.39 x 10-44 seconds

Planck Time: The Planck time is the fundamental unit of time in the Planck units system and is the smallest measurement of time that has any meaning. The Planck time is the "quantum of time" and is equal to {eq}10^{-43} s {/eq}. Answer and Explanation: