half period zone

half period zone
Physics
அரை அலைவு நேர மண்டலம்

English-Tamil dictionary. 2014.

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  • zone plate — noun : an optical device that consists of a series of concentric opaque rings of such width that rays from alternate half period elements are cut off and that has some properties of a converging lens * * * Optics. a plate or screen with… …   Useful english dictionary

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  • Triassic Period — Interval of geologic time, с 248–206 million years ago, that marks the beginning of the Mesozoic Era. Many new vertebrates emerged during the Triassic, heralding the major changes that were to occur in both terrestrial and marine life forms… …   Universalium

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  • Cretaceous Period — Interval of geologic time from с 144 to 65 million years ago. During the Cretaceous the climate was warmer than today. In the seas, marine invertebrates flourished, and bony fishes evolved. On land, flowering plants arose, and insects, bees in… …   Universalium

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  • Jurassic Period — Interval of geologic time, 206–144 million years ago, that is one of the three major divisions of the Mesozoic Era, preceded by the Triassic Period and followed by the Cretaceous. During the Jurassic, Pangea began to break up into the present day …   Universalium

  • Tertiary Period — Interval of geologic time, 65–1. 8 million years ago. It constitutes the first of the two periods of the Cenozoic Era, the second being the Quaternary. The Tertiary has five subdivisions: (from oldest to youngest) the Paleocene, Eocene, Oligocene …   Universalium

  • Witch trials in the Early Modern period — Punishments for witchcraft in 16th century Germany. Woodcut from Tengler s Laienspiegel, Mainz, 1508. The Witch trials in the Early Modern period were a period of witch hunts between the fifteenth and eighteenth centuries,[1] when across Early… …   Wikipedia

  • New Madrid Seismic Zone — Coordinates: 36°34′57″N 89°35′17″W / 36.58245°N 89.58801°W / 36.58245; 89.58801 …   Wikipedia

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