Coherence length is usually applied to the optical regime.

Coherence time, τ, is calculated by dividing the coherence length by the phase velocity of light in a medium ; approximately given by

* Coherence length

Coherence length is low ( typically < 1 mm ) and the typical linewidth is in the nm-range.

# REDIRECT Coherence length

* Coherence length

" Coherence and Incoherence in Historical Studies: From the Annales School to the New Cultural History ," New Literary History, olume 35, Number 2, Spring 2004, pp. 207 – 231 in Project Muse

Once the fringes are obtained in the Michelson – Morley experiment, when one of the mirrors is moved away gradually, the time for the beam to travel increases and the infringes become dull and finally are lost, showing Temporal Coherence.

Coherence time –

Coherence –

* Kees van Haperen ( 2002 ) Working Towards Information Superiority: Application Coherence for Digitisation Programmes – A Method for Coherently Defining Requirements for Future Command and Control Information Systems.

), The Current State of the Coherence Theory: Essays on the Epistemic Theories of Keith Lehrer and Laurence BonJour ( Dordrecht, Holland: Kluwer, 1989 ), pp. 276 – 92.

Beaugrande and Dressler define a text as a “ communicative occurrence which meets seven standards of textuality ” – Cohesion, Coherence, Intentionality, Acceptability, Informativity, Situationality and Intertextuality, without any of which the text will not be communicative.

* Coherence – defined as thinking, feeling and acting in the same way.

An astronomical unit ( abbreviated as AU, au, a. u., or ua ) is a unit of length equal to exactly or approximately the mean Earth – Sun distance.

Although a wide variety of graphite tube designs have been used over the years, the dimensions nowadays are typically 20 – 25 mm in length and 5 – 6 mm inner diameter.

The modern full size classical guitar has a scale length of around 650 mm ( 25. 6 inches ), with an overall instrument length of 965 – 1016 mm ( 38-40 inches ).

The scale-size for the smaller guitars is usually in the range 484 – 578 mm ( 19-22. 5 inches ), with an instrument length of 785 – 915 mm ( 31-36 inches ).

Two airports are more than 3, 047 meters in length, nine are 2, 438 – 3, 047 meters, 39 are 1, 524 – 2, 437 meters, 38 are 914 – 1, 523 meters, 12 are shorter than 914 meters, and 880 have unpaved runways.

A female lays 8, 000 – 25, 000 eggs at once and the strings can stretch up to in length.

In New Guinea, sexual maturity is reached by female toads with a snout – vent length between, while toads in Panama achieve maturity when they are between in length.

A recent detailed study of the Regnal List dates the arrival of the West Saxons in England to 538, and favours seven years as the most likely length of Ceawlin's reign, with dates of 581 – 588 proposed.

The centimetre – gram – second system ( abbreviated CGS or cgs ) is a variant of the metric system of physical units based on centimetre as the unit of length, gram as a unit of mass, and second as a unit of time.

* 1999 – present: length

The total length of the river is: 325 km in Russian Federation, 328 km in Belarus, and 367 km – in Latvia.

* 1799 – France adopts the metre as its official unit of length.

The = symbol was invented by Robert Recorde ( 1510 – 1558 ), who considered that nothing could be more equal than parallel straight lines with the same length.

The length within Egypt of the River Nile in its northwards course from three central African sources – the White Nile, the Blue Nile, and the Atbara – totals some 1, 600 km.

When used in science, for example geology, eras denote clearly defined periods of time of arbitrary but well defined length, such as for example the Mesozoic Era from 252 Ma – 66 Ma, delimited by a start event and an end event.

Putting together the different dates in the Chronicle for birth, death, and length of reign, it appears that Æthelberht ’ s reign was thought to have been either 560 – 616, or 565 – 618, but that the surviving sources have confused the two traditions.