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2.817 940 285 (31) × 10 −15 [18] The Compton wavelength of the electron λ C: 2.426 310 215 (18) × 10 −12 [18] The reduced Compton wavelength of the electron λ C: 3.861 592 6764 (18) × 10 −13 [19] The Compton wavelength (or reduced Compton wavelength) of any fundamental particle λ x: The Bohr radius of the hydrogen atom (Atomic unit ...
The Gough Map, dating to about 1360, is the oldest known road map of Great Britain. In 1500, Erhard Etzlaub produced the "Rom-Weg" (Way to Rome) Map, the first known road map of medieval Central Europe. It was produced to help religious pilgrims reach Rome for the occasion of the "Holy Year 1500".
A regular n-gon has a solid construction if and only if n=2 a 3 b m where a and b are some non-negative integers and m is a product of zero or more distinct Pierpont primes (primes of the form 2 r 3 s +1). Therefore, regular n-gon admits a solid, but not planar, construction if and only if n is in the sequence
13 cm = 1.3 dm – body length of a Goliath birdeater; 15 cm = 1.5 dm – approximate size of largest beetle species; 19 cm = 1.9 dm – length of a banana; 26.3 cm = 2.6 dm – length of average male human foot; 29.98 cm = 2.998 dm – distance light in vacuum travels in one nanosecond; 30 cm = 3.0 dm – maximum leg length of a Goliath birdeater
A variety of rulers A carpenter's rule Retractable flexible rule or tape measure A closeup of a steel ruler A ruler in combination with a letter scale. A ruler, sometimes called a rule, scale or a line gauge or metre/meter stick, is an instrument used to make length measurements, whereby a length is read from a series of markings called "rules" along an edge of the device. [1]
A graphical or bar scale. A map would also usually give its scale numerically ("1:50,000", for instance, means that one cm on the map represents 50,000cm of real space, which is 500 meters) A bar scale with the nominal scale expressed as "1:600 000", meaning 1 cm on the map corresponds to 600,000 cm=6 km on the ground.
Although the "paradox of length" was previously noted by Hugo Steinhaus, [1] the first systematic study of this phenomenon was by Lewis Fry Richardson, [2] [3] and it was expanded upon by Benoit Mandelbrot. [4] [5] The measured length of the coastline depends on the method used to measure it and the degree of cartographic generalization. Since ...
In mathematics, a Golomb ruler is a set of marks at integer positions along a ruler such that no two pairs of marks are the same distance apart. The number of marks on the ruler is its order, and the largest distance between two of its marks is its length. Translation and reflection of a Golomb ruler are considered trivial, so the smallest mark ...