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...ls of known [[energy]] (or [[frequency]], according to [[Planck's constant|Planck's formula]]). [[Scattering theory]] provides the theoretical background for

...sen. Periodic events and periodic motion have long served as standards for units of time. Examples are the apparent motion of the sun across the sky, the ph ...e believed to fail at this time scale, and many physicists expect that the Planck time might be the smallest unit of time that could ever be measured, even i

...t]]. However, this approach fails at short distances of the order of the [[Planck length]], where a more complete theory of [[quantum gravity]] (or a new app ...about 12 mm); by 2/20ths it has dropped at total of 4 units; by 3/20ths, 9 units and so on.

* In Germany, [[Max Planck Society]] * [[Scientific units named after people]]

* In Germany, [[Max Planck Society]] * [[Scientific units named after people]]