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  2. Klein paradox - Wikipedia

    en.wikipedia.org/wiki/Klein_paradox

    Relativity adds a third solution: very steep potential steps appear to create particles and antiparticles that then change the calculated ratio of transmission and reflection. The theoretical tools called quantum mechanics cannot handle the creation of particles, making any analysis of the relativistic case suspect. [ 3 ]

  3. Mark (designation) - Wikipedia

    en.wikipedia.org/wiki/Mark_(designation)

    In British military practice, Mark ("Mk") designations were given in Roman numerals (replaced by Arabic numerals in 1944) to reflect variants of or production changes to service weaponry, either on their own or as part of numerical ("No.") designations; in the Lee-Enfield rifle series for example, the SMLE rifles were produced to Mk I, Mk III, and Mk V specification (with the latter two later ...

  4. BL 9.2-inch Mk IX – X naval gun - Wikipedia

    en.wikipedia.org/wiki/BL_9.2-inch_Mk_IX_–_X...

    The 9.2-inch Mk XI gun introduced in 1908 increased the bore length to 50 calibres in an attempt to increase the velocity still further, but proved unsuccessful in service and was phased out by 1920. The Mk X was hence the final Mark of 9.2-inch guns in widespread British Commonwealth service. The BL 9.2 also affected the development of radar.

  5. Matthew 9:2 - Wikipedia

    en.wikipedia.org/wiki/Matthew_9:2

    Cornelius a Lapide comments on the words, "And seeing their faith, ..." which he says is clearly the faith of those who brought the paralytic to Christ. Because when they could not bring him into the house, they carried him up to the roof, [a] although he also adds the faith of the paralytic in the group since Jesus would never have forgiven his sins, "unless he had had faith". [1]

  6. Transfiguration of Jesus - Wikipedia

    en.wikipedia.org/wiki/Transfiguration_of_Jesus

    [1] [2] The Synoptic Gospels (Matthew 17:1–8, Mark 9:2–13, Luke 9:28–36) recount the occasion, and the Second Epistle of Peter also refers to it. In the gospel accounts, Jesus and three of his apostles, Peter, James, and John, go to a mountain (later referred to as the Mount of Transfiguration) to pray. On the mountaintop, Jesus begins to ...

  7. Prince Rupert's cube - Wikipedia

    en.wikipedia.org/wiki/Prince_Rupert's_cube

    The other two rectangle vertices are the reflections of the first two across the center of the cube. [4] If the aspect ratio is not constrained, the rectangle with the largest area that fits within a cube is the one of aspect ratio 2 {\displaystyle {\sqrt {2}}} that has two opposite edges of the cube as two of its sides, and two face diagonals ...

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  9. AI Mark VIII radar - Wikipedia

    en.wikipedia.org/wiki/AI_Mark_VIII_radar

    This operated at 9.1 cm wavelength (3 GHz), much shorter than the 1.5 m wavelength of the earlier AI Mk. IV. Shorter wavelengths allowed it to use smaller and much more directional antennas. Mk. IV was blinded by the reflections off the ground from its wide broadcast pattern, which made it impossible to see targets flying at low altitudes. Mk.