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Incandescent light bulb. A 230-volt incandescent light bulb with a medium-sized E27 (Edison 27 mm) male screw base. The filament is visible as the mostly horizontal line between the vertical supply wires. A scanning electron microscope image of the tungsten filament of an incandescent light bulb. Elaborate light in Denver, Colorado.
Fourier-transform infrared spectroscopy ( FTIR) [1] is a technique used to obtain an infrared spectrum of absorption or emission of a solid, liquid, or gas. An FTIR spectrometer simultaneously collects high-resolution spectral data over a wide spectral range. This confers a significant advantage over a dispersive spectrometer, which measures ...
Ultraviolet ( UV) light is electromagnetic radiation of wavelengths of 10–400 nanometers, shorter than that of visible light, but longer than X-rays. UV radiation is present in sunlight, and constitutes about 10% of the total electromagnetic radiation output from the Sun. It is also produced by electric arcs, Cherenkov radiation, and ...
t. e. The Columbine High School massacre, commonly referred to as Columbine, was a school shooting and a failed bombing that occurred on April 20, 1999, at Columbine High School in Columbine, Colorado, United States. [b] The perpetrators, twelfth-grade students Eric Harris and Dylan Klebold, murdered twelve students and one teacher.
The Adélie penguin ( Pygoscelis adeliae) is a species of penguin common along the entire coast of the Antarctic continent, which is the only place where it is found. It is the most widespread penguin species, and, along with the emperor penguin, is the most southerly distributed of all penguins. It is named after Adélie Land, in turn, named ...
Total: 255,268 (56,643 dead) [6] [11] The Gallipoli campaign, the Dardanelles campaign, the Defence of Gallipoli or the Battle of Gallipoli ( Turkish: Gelibolu Muharebesi, Çanakkale Muharebeleri or Çanakkale Savaşı) was a military campaign in the First World War on the Gallipoli peninsula (now Gelibolu) from 19 February 1915 to 9 January 1916.
Liberia remained neutral during World War I until August 4, 1917, when it declared war on Germany. Subsequently, it was one of 32 nations to take part in the Versailles Peace Conference in 1919, which ended the war and established the League of Nations; Liberia was among the few African and non-Western nations to participate in both the conference and the founding of the League.
